Just looking at this post as an example, on lemmy.world show it has 29 comments, but when i open it, there are now only 3 or 4. I replied to one comment, the user i replied to got banned, and the whole comment tree is gone from lemmy.world. Other instances still show all comments, including those from the banned user and my reply. I think it’s very confusing when a single post appears with different comments on different instances, and have no idea how this works.
Edit: why am i forced to upload a photo for a new post?
Same as before: you have to take that into consideration only if you want. Probably you never cared at all when you signed to a new app in big corporation and just gave away all your data but now that there are options suddenly everyone cares and it's annoying.
This are important topics, it was time to take them seriously. This is precisely why federation is important - the instances and users can moderate, it's not a single organism that has absolute control over eveything.
Referencing Matrix when he says "why do my eyes hurt" just after waking from Matrix... It's the same here: we will all get use to have more freedom of choice, now it seems more complicated because we never had that freedom and never worried about a lot of topics that are important.