I'd also like to be clearer on what features (or misfeatures) are:
(1) Specific to Tusky (or other app)
(2) Specific to mastodon.social (or other server)
(3) General to the whole Fediverse.
For example: I notice that people I follow can write long posts, but I can't. Is this some setting I haven't turned on yet, or do I need to switch from mastodon.social to another server if I want to write long posts?