Better editable position
The web client is not very efficient at displaying large list of records.
So when an editable list with bottom is used, the row is added at the end of the list. This forces the client to display all the records (slowly).
There have been already some attempt to improve the display #8199 (closed) but it is not yet fast enough to not care about this inefficient use case.
I propose that main editable list are by default set to 'top' and when used inside a One2Many, it is set to 'bottom' (expected behavior when adding a line).