How would you compare Elixir with Kotlin (or similar) in terms ease of use and efficiency?

ActivityPub has been around for 8 years, and IMO, the Fediverse is not evolving. It is not federating the way ActivityPub was designed for.

From this I thought you are referring to the fedi platforms in general. I saw later you wrote specifically about Lemmy; so ok.
Still, my example shows that the Fediverse is evolving (even if it might be slow). Lemmy and Mastodon might be the biggest platforms out there, but they might not be the ultimate prestige examples of our network.

They said Diaspora never gained support, not Friendica.

I can’t show you directly, as fedia.io requires login to access the platform (scraper protection), but I was able to open the channel by searching for their handle, the page showed up videos (also recent ones) and the video-posts had comments. The page show the channel-logo and every post had the thumbnail of the video.
One click on the title when you have to post open, and it will open the original page in a new tab, which then can play the video. Even better: Mbin automatically inserts the embedded viewer for the posted video, so you don’t even have to leave fedia.

So please don’t draw conclusions from Lemmy to all fedi projects.

And for some fedi projects even a handful of regular contributors would be much.

or hate for other platforms?

I contribute to Mbin out of passion for the Fediverse and the idea Mbin is build upon. But hate against bigtech is also a factor here and there :D

That is not really correct, posts are represented differently from threads in Mbin (internally and in the UI). You don’t have to post to a specific magazine / community. If you want your post to just float around in the Fediverse (so have the post associated with just your account + hashtags) you choose the random magazine for the post.
I admit that this is not really intuitive and the random magazine is a crutch for this platform to handle plain posts. To make it a bit easier to grasp I created a PR to select the random magazine if one is not on a magazine page.

But all of what you described is possible with Mbin. As an example I created this post (using the form on the generic microblog page) which you can see under posts on my local account. I would like to add links to federated Mbin and Mastodon instances, but nobody follows me, so remote instances don’t pull posts.

What is currently not possible is to follow hashtags (but you can list posts), but I am going to implement this soon.

What exactly do you mean “to a profile”? Can you give an example of the difference (I never used Mastodon)?

Could you describe your problem in more detail?

Microblogs are always associated to your profile. If you want to post something which is not meant for a specific magazine, the random magazine is what you need to use. It is a pseudo-magazine (and so not federated as a community) which aggregates all microblog posts which are not attached to a real magazine.