We have to focus the editor here so that if you’re inserting a table at a specific position then it happens in that position. Focusing any sort of input like that forces the on screen keyboard to display which isn't a behaviour that we can resolve.
Also it really only becomes an issue here if you want to insert more than 6 rows at insert time. More rows can be added any time so it's not exactly a showstopper.
It's likely easier if we leave this as it is.