Yes, I'm also using Hetzner and have not run into any limits in what plugins you can install and use yet. They used to call 'storage share' just 'Nextcloud', but moved it to the new name for licensing reasons.

I don't know what type of hardware they're running their Nextcloud instances on, but I've been using calendar/contacts and public file sharing (since Firefox Send went down) on the cheapest plan for a while now and it's fine. I also dabbled a bit in using Nextcloud's maps, video calling, bookmarks and rss reader applications and it all works OK, although I didn't stick to them because they're not the most rich in features. I had to Hetzner email support a few times and got a helpful reply within 1-2 work days, sometimes quicker, which I thought was fine.