Android browsers can already add pages to home screen but Hermit takes this even futher.
It has significantly better UX with frameless and full screen modes. You can bookmark pages, so on Lemmy you can quickly bookmark community in specific sorting order. There are user scripts and blockers and loads of customization. You can even add push notifications for changes on the site or RSS feed.
I’ve been running most Fediverse web apps through Hermit and it works really well! The only exception is that I couldn’t figure out how to setup notifications on Mastodon.
Tried it for Kbin, and in that specific case the only advantage it seems to have over Chrome’s wep app function is the rotation bug. That’s great, but most of the features that might be worthwhile are locked behind a paywall.