What if there were default unchangeable categories, where you can break them down and follow them at whatever level of the breakdown you want, but you would automatically follow everything below the level that you chose.

For example: News, News.Ukraine, News.Ukraine.Username or Music, Music.Electronic, Music.Electronic.Free

If someone follows Music.Electronic, they automatically follow Music.Electronic.Free as well. If someone only wanted free electronic music, they could just follow Music.Electronic.Free.

And when you make a post, as suggestions, the subsequent tag additions will pop up somewhere in a box listed based on most used. This way, we can be precise, but we can also not limit the exposure by being too obscure, because users can choose to follow one of the larger branches. I think the current problem with this site is exactly what you said, things are scattered everywhere not necessarily in the right place. The only reason why we can catch everything is because currently there isn't a huge userbase.

Edit: Or maybe that's how it already works, I can't really tell.