@j12t More generically, a bit of a turnoff is not seeing everything from everywhere, unlike other social media where you can see everything for an account (in theory).
Eg, missing comments from a thread etc, which can happen on small instances.

At the start it did give me a bit of FOMO, but i've got over it now (mostly!).
I hardly used social media before, so this might be more pronounced for others that are migrating away from traditional social media networks.