Examples:

• Mastodon could use the up down reddit style boost/like buttons
• Just giving stylistic differences to services is less important (but end users love it) as it is easier to implement …
• Certain aspects are a nightmare of complexity for end users, for example taking followers to new instances should be automatic, then give users the option to unsubscribe, downvote etc
• User simplicity is the strength of the centralised twitter, reddit etc … until the content pushing/commercial payback of bubble bursting overvaluations …