@wonderfox well I used to work on it so a lot of this is anecdotal, but originally Akkoma removed the shoutbox and pleroma chats, then I added an option to help show users when they are blocked to avoid the accusation of "pleroma users block evade" (by not being aware of it) which FG then undid

And then the dev did this blog post saying by November a bunch more options will be stripped
https://coffee-and-dreams.uk/development/2023/07/24/1-year-of-akkoma.html

As far as issues we've had a lot of bugs unique to Akkoma from just having one stubborn dev who does controversial changes, whereas Pleroma gets tested for months before changes are pushed to stable. The most recent bug breaking federation because the dev wanted to force a new version of Phoenix