Well, i thought the same about rust and python. i'm not a dev and lack understanding on their component.

My opinion became more nuanced with Lemmy. I have read there spike in ressource usage with lemmy on server.

So, I believe the language matter but also its features, the way you think how people will use it. Its core design.

When you manage a social network, the most fondamental feature is the moderation board. I find this area is lacking on Lemmy. Crosspost ? Duplicate everywhere, on my timeline, i get 4-5 time the same post...so i believe it miss some design thinking.

From what i see, the various lemmy-bot (most of them are written in python i think ?) and alternative frontend are improving lemmy experience. For example, how do you add an mod with lemmy-web-ui ?

I also believe that being written in Rust make it harder for new devs to help. But in later time we will see a change.

I'm not sure if it answer part of your question, but there are area where lemmy can improve :
https://join.piefed.social/2024/02/09/comparing-network-utilization-of-lemmy-kbin-and-piefed/