defanor, Poking around the snac web interface, here is my test toot with first impressions of it:
I like the HTTP basic authentication, in addition to the fairly predictable JS-free interface.
The CSS-based hidden blocks are rather unusual though. But at least thoir behavior must be predictable once you get used to them.
The dark theme has issues: white-on-black is too much of a contrast, and notifications make it white-on-red (#FFF on #F00)), the contrast ratio of which is too low. Also buttons with bright borders seem to stand out more than texts do.
No browsing of posts from other instances, apparently. Which is okay, though such proxying would have been handy, given that accessing them directly would lead back to the JS-heavy interfaces.
No personal archive (backup) functionality in sight.
Looks nice overall: simple and fairly straightforward, as was advertised.
Update: apparently no hashtag following here, either. Not much of exploration-related functionality in general, it seems.