I think the NSFW tag has to be more sharp, like only literal porn or gore is tagged NSFW. One of the most frustrating thing on r*ddit was that regular memes or text posts would get tagged as NSFW just for containing a swear word or something, so turning NSFW completely off would hide a ton of regular stuff too.

The problem with subscribing to communities at this point is the lack of content. I subscribed to a few different baseball communities, but none of them have anything other than maybe a welcome post or a few gameday posts without any comments. Communities are duplicated on a bunch of different instances too, which makes things a million times harder than it needs to be. I have no idea if one of the half dozen baseball communities I'm in now will make it big, if a new one entirely will make it big, or if they're all doomed to never have content.

you can block instances

Slight correction (not to be pedantic, we’re all learning here): you can currently block communities, but not instances. (Apparently being able to block instances at the user-level is coming)