It’s entirely subjective, and I agree with
@doctorbadwolf, readability is not a critique I have commonly seen of 4e.
End it on that note, fine, but calling it a positive note that WotC “learned their lesson” is extremely dismissive of people who liked 4e’s writing.
Every edition is a standalone game. People can choose to mix and match elements from other editions if they wish, but the fact that a rulebook written for one game isn’t useful for another game that didn’t even exist yet at the time it was written is not a weakness of that rulebook.
Whereas I always see people lament that they can’t tell what their spells do at a glance, and that the use of natural language creates undesired ambiguity in the rules of 5e. As do you, apparently, since you said such complaints are why you brought up the readability issue in the first place.