yes your mileage may vary. haven't been in a situation where KDE or Gnome had something which I couldn't get done cheaper:

just an idea of what happens if I were to install konqueror on a non-kde system:

sudo apt-get install konqueror
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
baloo-kf5 catdoc dolphin kactivities-bin kactivitymanagerd
keditbookmarks kfind kimageformat-plugins kinit kio
kio-extras kio-extras-data kpackagelauncherqml
kpackagetool5 kwayland-data kwayland-integration
libdbusmenu-qt5-2 libdolphinvcs5 libfam0 libhfstospell10
libkf5activities5 libkf5archive5 libkf5attica5
libkf5auth-data libkf5auth5 libkf5baloo5 libkf5balooengine5
libkf5baloowidgets-bin libkf5baloowidgets5
libkf5bookmarks-data libkf5bookmarks5 libkf5codecs-data
libkf5codecs5 libkf5completion-data libkf5completion5
libkf5config-bin libkf5config-data libkf5configcore5
libkf5configgui5 libkf5configwidgets-data
libkf5configwidgets5 libkf5coreaddons-data
libkf5coreaddons5 libkf5crash5 libkf5dbusaddons-bin
libkf5dbusaddons-data libkf5dbusaddons5
libkf5declarative-data libkf5declarative5 libkf5dnssd-data
libkf5dnssd5 libkf5doctools5 libkf5filemetadata-bin
libkf5filemetadata-data libkf5filemetadata3
libkf5globalaccel-bin libkf5globalaccel-data
libkf5globalaccel5 libkf5globalaccelprivate5
libkf5guiaddons5 libkf5i18n-data libkf5i18n5
libkf5iconthemes-bin libkf5iconthemes-data
libkf5iconthemes5 libkf5idletime5 libkf5itemviews-data
libkf5itemviews5 libkf5jobwidgets-data libkf5jobwidgets5
libkf5js5 libkf5kcmutils-data libkf5kcmutils5
libkf5kdelibs4support-data libkf5kdelibs4support5
libkf5kdelibs4support5-bin libkf5khtml-bin libkf5khtml-data
libkf5khtml5 libkf5kiocore5 libkf5kiofilewidgets5
libkf5kiogui5 libkf5kiontlm5 libkf5kiowidgets5
libkf5kirigami2-5 libkf5konq6 libkf5newstuff-data
libkf5newstuff5 libkf5newstuffcore5
libkf5notifications-data libkf5notifications5
libkf5package-data libkf5package5 libkf5parts-data
libkf5parts-plugins libkf5parts5 libkf5pty-data libkf5pty5
libkf5quickaddons5 libkf5service-bin libkf5service-data
libkf5service5 libkf5solid5 libkf5solid5-data
libkf5sonnet5-data libkf5sonnetcore5 libkf5sonnetui5
libkf5textwidgets-data libkf5textwidgets5 libkf5wallet-bin
libkf5wallet-data libkf5wallet5 libkf5waylandclient5
libkf5widgetsaddons-data libkf5widgetsaddons5
libkf5windowsystem-data libkf5windowsystem5
libkf5xmlgui-bin libkf5xmlgui-data libkf5xmlgui5
libkwalletbackend5-5 libminizip1 libphonon4qt5-4
libpolkit-qt5-1-1 libpoppler-qt5-1 libqt5quickcontrols2-5
libqt5quicktemplates2-5 libqt5script5 libqt5texttospeech5
libqt5waylandclient5 libqt5waylandcompositor5
libqt5webengine-data libqt5webenginecore5
libqt5webenginewidgets5 libre2-5 libssh-4 libvoikko1
phonon4qt5 phonon4qt5-backend-vlc
qml-module-org-kde-kirigami2 qml-module-org-kde-newstuff
qml-module-qtqml-models2 qml-module-qtquick-controls2
qml-module-qtquick-templates2 qtwayland5 sonnet-plugins
Suggested packages:
tk | wish dolphin-plugins konq-plugins fam voikko-fi
phonon4qt5-backend-gstreamer hspell
The following NEW packages will be installed:
baloo-kf5 catdoc dolphin kactivities-bin kactivitymanagerd
keditbookmarks kfind kimageformat-plugins kinit kio
kio-extras kio-extras-data konqueror kpackagelauncherqml
kpackagetool5 kwayland-data kwayland-integration
libdbusmenu-qt5-2 libdolphinvcs5 libfam0 libhfstospell10
libkf5activities5 libkf5archive5 libkf5attica5
libkf5auth-data libkf5auth5 libkf5baloo5 libkf5balooengine5
libkf5baloowidgets-bin libkf5baloowidgets5
libkf5bookmarks-data libkf5bookmarks5 libkf5codecs-data
libkf5codecs5 libkf5completion-data libkf5completion5
libkf5config-bin libkf5config-data libkf5configcore5
libkf5configgui5 libkf5configwidgets-data
libkf5configwidgets5 libkf5coreaddons-data
libkf5coreaddons5 libkf5crash5 libkf5dbusaddons-bin
libkf5dbusaddons-data libkf5dbusaddons5
libkf5declarative-data libkf5declarative5 libkf5dnssd-data
libkf5dnssd5 libkf5doctools5 libkf5filemetadata-bin
libkf5filemetadata-data libkf5filemetadata3
libkf5globalaccel-bin libkf5globalaccel-data
libkf5globalaccel5 libkf5globalaccelprivate5
libkf5guiaddons5 libkf5i18n-data libkf5i18n5
libkf5iconthemes-bin libkf5iconthemes-data
libkf5iconthemes5 libkf5idletime5 libkf5itemviews-data
libkf5itemviews5 libkf5jobwidgets-data libkf5jobwidgets5
libkf5js5 libkf5kcmutils-data libkf5kcmutils5
libkf5kdelibs4support-data libkf5kdelibs4support5
libkf5kdelibs4support5-bin libkf5khtml-bin libkf5khtml-data
libkf5khtml5 libkf5kiocore5 libkf5kiofilewidgets5
libkf5kiogui5 libkf5kiontlm5 libkf5kiowidgets5
libkf5kirigami2-5 libkf5konq6 libkf5newstuff-data
libkf5newstuff5 libkf5newstuffcore5
libkf5notifications-data libkf5notifications5
libkf5package-data libkf5package5 libkf5parts-data
libkf5parts-plugins libkf5parts5 libkf5pty-data libkf5pty5
libkf5quickaddons5 libkf5service-bin libkf5service-data
libkf5service5 libkf5solid5 libkf5solid5-data
libkf5sonnet5-data libkf5sonnetcore5 libkf5sonnetui5
libkf5textwidgets-data libkf5textwidgets5 libkf5wallet-bin
libkf5wallet-data libkf5wallet5 libkf5waylandclient5
libkf5widgetsaddons-data libkf5widgetsaddons5
libkf5windowsystem-data libkf5windowsystem5
libkf5xmlgui-bin libkf5xmlgui-data libkf5xmlgui5
libkwalletbackend5-5 libminizip1 libphonon4qt5-4
libpolkit-qt5-1-1 libpoppler-qt5-1 libqt5quickcontrols2-5
libqt5quicktemplates2-5 libqt5script5 libqt5texttospeech5
libqt5waylandclient5 libqt5waylandcompositor5
libqt5webengine-data libqt5webenginecore5
libqt5webenginewidgets5 libre2-5 libssh-4 libvoikko1
phonon4qt5 phonon4qt5-backend-vlc
qml-module-org-kde-kirigami2 qml-module-org-kde-newstuff
qml-module-qtqml-models2 qml-module-qtquick-controls2
qml-module-qtquick-templates2 qtwayland5 sonnet-plugins
0 upgraded, 147 newly installed, 0 to remove and 0 not upgraded.
Need to get 72.7 MB of archives.
After this operation, 310 MB of additional disk space will be used.
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