The db0 folks did spin up the anarchist.nexus piefed instance if you want to give it a try!
This is all configurable by site admins and not baked into the code.
Relevant issue: https://codeberg.org/rimu/pyfedi/issues/252
I have never used yunohost before, but ldap was just recently integrated into piefed (that's what chat.piefed.social uses for instance). So the main blocker from that issue seems resolved.
Ugh...this one still frustrates me a lot. If I could wave a magic wand and have a different contributor do two things for the project, animated gifs would be one and a more consistent compact layout would be the other.
Edit: Just want to add that when I was working on the gif problem, I got it working for posts...but you have to click through into the lightbox or to the complete image url...the thumbnail isn't animated. So, I got partway there, but ran into technical limitations of the specific python library being used. Relevant issue.
As somebody that has done a lot of recent work on the UI for piefed, I have tried to make sure that it works even at quite small screen sizes. I actually just submitted a couple commits in the past couple hours to make the navbar across the top of communities/feeds/topics flow smoother across different screen sizes. The PWA is so far my preferred way to use piefed.