I believe the original intent was to tag non-Bitcoin content with #grownostr plus any other appropriate hashtags. Then you could follow grownostr, find interesting things, and start following those hashtags as well as interesting people. So you are 100% right. I find myself forgetting to add those additional tags.
Discussion
I'm totally in with #grownostr, #asknostr and #nostr in general. All I mean is, when you tag #tumestr, also tag #music and so on.
People joining newly shouldn't have to know the nostr dictionary to be able to take part in the discussion