I can never rely on people to self-tag posts. But tagging communities would be much more manageable and helpful.

Maybe communities should come with default tags. That would make it a lot easier.

And with apps we can filter text.

Do it like AO3 and enforce only about a dozen mandatory tags, and allow 'choose not to tag' tag if you don't want to tag, and you can choose to filter out the choose not to tag content..