@dilectric It's not ease of use if the social network doesn't behave as the user believes it should.
Let me give you an example.
Joe on Lemmy is commenting on a group post.
Sally on Mastodon sees that comment, makes a reply, doesn't understand the context -- because she doesn't know that Joe is talking to a group.
And why would she? Mastodon doesn't support groups. She doesn't expect people on her social network to make use of groups.