yes, tags are the intended discovery mechanism. i know that, especially for people coming from twitter, this is a tricky mindset to get into.
we don't have full-text search for a few reasons:
- it's hard
- it removes control from posters about where their content is visible.
posting something and not tagging it makes it effectively follower-only. if you want people to see it, tag it. that's it
I usually tag not to be discovered but to ensure people's tag muffles help them not see what they don't want to see.
I am pedantically making this distinction only bc I think there are still a number of ppl who don't tag bc they, like me, don't care about being discovered most of the time, but should shift into the mindset of "tagging is the responsible thing to do to make sure people don't see shit they don't want to see." Community-minded behavior, etc. etc.
Just my 2 cents!

