Can magazine tags be applied to all the content posted in that magazine?

As far as I can tell, magazine tags are mainly used when searching for magazines, and maybe for determining related magazines.

But I think mag tags should be applied automatically to threads and posts inside each magazine. This would make for a decent multireddit substitute.

If I'm looking at the #tech tag feed, I think that should include a lot of content from a lot of different sources that have marked themselves as #tech, not just the individual threads that remembered to actually tag it lol.

In the future, being able to make my own customized feeds would effectively allow for a proper multi-feed experience! Like #tech+#DIY+#raspberrypi feed, or whatever!

Okay, tell me why this is technically difficult, impossible, or otherwise won't work the way that I'm hoping lol.