I want to add my praise to the heap.
I'm pretty happy with Voyager on mobile, but when writing something, it's not ideal.
The generic Lemmy UI is more than OK on desktop, but the lack of error code reporting to the user was frustrating, at times I tried to resubmit posts and comments and the spinning Submit button just kept on going, for some communities in particular. So I stopped posting in these communities.
Now, with Alexandrite, I feel like this is a good UI that I really like. And I love that you write out the background error message for why posting or commenting fails!
Really nice job!