In my opinion it's getting harder to distinguish who is/was talking to whom lately.
It can be pretty confusing (and it's not really comfortable) to follow a thread of Alice - known as Bob until yesterday - answering to a comment/post originated by Fred, who has changed his/her name to Dharma four weeks ago, created and deleted a comment under that name, and changed the name again to Sally the day before yesterday and commenting again.
This is just a hypothetical example, but you know what I mean.
Can I find out the renaming history of a user in a post's context (or in general)?
How am I supposed to easily follow threads with massive name changes (and/or comment deletions)?