playframework/Play20 — comment on commit 81a4d8a2998f573cf593eb3e9186e1e7e7adb715
File:  line 0
By kevinbosman:

Personal preference.
You could also put only bootstrap.less into assets/stylesheets, leave all the other modules in a subfolder. Modify the code in bootstrap.less to include the subfolder in all the imports.