I'm using it for a year and it came a long way. Though still in beta and still have some major bummers (which require hacking). But it only came out in 2023. The next update should add a ton of QoL things, so this will be pretty exciting.
Since for me it has all the needed features, for me — it's by far superior (even compared to LuaLaTeX which is the last thing I used). But some people, mainly from academia, are still can't switch due to some features missing. A few people were able to create thesis in Typst (including myself). In the long run it will be 100% superior. In the mean time, there are a few hacks to enable some features that are otherwise not implemented yet.
The last point: I use MuPDF + entr as zarhura crush as a mf, not usable at all. Some others use typst-preview which can be used in the browser and as a VS Code extension. But I use Neovim btw and the web version lack a few key features. Anyway, I use mupdf+entr+nvim for many months now and it's more than enough for me.
The web version, for me, is just to share my local project with someone, that's it.
Well, that can't be changed now. People discuss NSFL in there, but I don't know what will be the rustler of it. Maybe it will be NSFW + NSFL tag. You can always create a new issue demanding NSFL to be treated as a special tag.
Well, overleaf.com is for LaTeX, but typst.app is for Typst, a superior alternative witch is in beta. So for some people it won't be enough (yet), but for me it's awesome.
Thesis is an example. I use it for any document.