freebeer (2018-12-18 01:23:05+00:00): thanks for the explanation.

regarding the houses, well, that is hard for me to evaluate when none of them are mapped yet.  i am again using achavi at
https://nrenner.github.io/achavi/?changeset=58046248
and i recommend changing the default dark background in the upper right corner to plain `OSM' to best see what is presently mapped.

now from my editor in a different window i can see a significant number of houses in the southwest (that from afar i thought was woods) as well as as more northerly along the west which were partially excluded from the awkward coarse outline.  also on the east side i see mostly houses, but i also see that on the north and east the grounds outline was tied to the centre of the roads, so i don't expect much attention to detail.

nonetheless, i don't feel that merited deletion of the other user's work, which is very demoralising to them, particularly without making an effort to replace it with somethig better.  it would have been possible to fine-tune the lower left as well as the upper left with little difficulty, with a bit of care, to much more closely follow the probable grounds outline - i cannot see a fence like elsewhere i traced.

in any case, it may have seemed easier to delete the old outline and replace it, but the latter half of that did not occur, and rather than having a coarse outline present, instead there is none, no easy way to see the general area a school can be found.

(I won't comment on the quality of the northwest outline of the high school building outline other than to note it also is not true to the physical building outline and includes some non-building as well)

Now to Johnny Mapperseed's outline, it appears to exclude the houses and follow the grounds outline that i see, presuming that scrubby bit of forest is part of the school grounds.

I see no evidence of any public park, nor a pool, within the grounds outline.  The Community Pool and attached park i do find between the two outlines is well outside them both.

There are differing attitudes to mapping trees, or, well, anything.  There are actually quite a few municipal governments that have made their tree data records available to be imported into OSM, and because someone, somewhere, will probably have an interest to map something and make that data available via OSM.

If i recall, there was discussion about an issue with one of these imports today (your time, technically yesterday for me).  I was hoping to find a good example of how that data appears in OSM, but i guess i will have to settle for
https://www.openstreetmap.org/#map=18/48.20047/16.36827&layers=N
which doesn't have that much, but hey, that is official data their government is working to keep up-to-date.

What does not make sense to you to map, makes sense to someone of the many thousands of governments and businesses that are relying on osm data and contributing to it.  you may not see a need to map private house driveways, or even houses, but there are several firms who have a business need for it and are paying to have that data be added, even though there are others who feel such private info does not belong on the map, take matters into their hands, and purge that unsightly data.

i probably would secretly be happy if all the highway info were deleted as i have no use for it; all i need are the fountains and benches i've mapped and the shops with cheap beer.  but that is not the point of osm, so instead i work to preserve the data from anyone for anyone.

About the tree rendering in Wien above, the reason it was difficult for me to find trees was that a decision was made some time ago that making trees visible was unimportant, so they do not appear unless you zoom in very close.  just like public toilets (which i should have mentioned above as important to me as well) and now bancomats which only appear at the closest level, when really, if the nearest WC is 5km away, i want to be able to see it at almost all levels of detail.

the same should be true for your navigation app - you should be able to select what should appear and how prominently and what to ignore, as ever more useful detail gets added, as well as useless to you info.

essentially, the rules i would pass along on me deathbed are to respect the data as being important to someone, respect the work and contributions of other mappers, improve rather than destroy, help other mappers out (unless they are peronally known to you in which case let the edit wars commence), don't edit the map with maps.me, make potlatch 1 your default editor, and never ever let yourself get as addicted as i, lest you never be able to sleep normally again.

is this long enough yet?

cheers