I think most of these changes are for two things.
The first is to give the player more things to do on his turn (including shove) and the second is probably more important to speed up the fights.
Each round the player has to spend on disangage instead of offensive action extends the fight quite a bit.
You may think that this is not a big problem, but reading some opinions according to some people the fight is still too slow.
The question is whether this group of players is really big enough to justify this change.