generally the approach to features is different as well.
controversial things get turned off by default, such as follow suggestions, which are supported but individual instance admins have to enable. afaik, only two pleroma instances have this enabled.
there's also a tendency in mastodon's issue tracker that a lot of the feature suggestions are ... impossible to implement within activitypub, or they're about steering the entire network in a certain direction. we're generally not interested in that, it's better to just work with what we can actually do and give users and admins customization options for things that effect the experience in significant ways (for example, there's an option to turn off the display of favourite and repeat counters, and there's also a fairly powerful post rewriting and filtering plugin system built-in for admins to use).