We should not remove either of these, because they're pretty par for the course.
On RPG questions, once you get beyond the game system, you start tagging with the thing you're fretting about. Maybe it's attack and damage. Maybe it's feats or skills, or a class. None of these things are really things you can be an expert in "across all games" but that's not the bar - the question is, can you be an expert in - or be interested in following- questions about D&D 3.5e feats? Or attacking in 5e? Yes you can, and people are. I suspect the AnyDice Attack Squad would be interested in attack and damage questions for example, so they get to do those lovely DPS graphs.
If these aren't legit tags, which describe large and common parts of many rulesets, then we only have about 10 legit tags on the site.