can't see anything wrong, can you help me here? What do you mean individual messages? Each reply is correctly quoting the parent post, so naturally it appears multiple times.
replies should be under the original post, they have different meaning than standalone posts. In "for you" I expect standalone posts, if I want to read discussion, open replies.
rn "for you" is a chronological feed of everything you follow. If you only see top level posts then you'll miss half-or-more of the discussions happening in the site. I'm not so sure about this change.
added two more screenshots to - the "root" post view is incorrect, but when reply-on-reply, information goes up-then-down.
root post view IS correct, sorry.
I understand your confusion, but that's the formatting - quoted parent is below the child post - then that post's replies follow in the discussion view. The top post is always quoting its parent below it, the different bg makes it distinct. Just need to get used to it, same on X.
There really is no other way to include the parent otherwise, you have to break the hierarchy at some point, the other form would need to omit the parent body and show a 'parent' link but we want to include its body.