Yes. Not only have I considered it. I’ve done it. The issue is that the Lemmy communities aren’t that big, even when you’re not referring to smaller instances and just sticking to federated communities, so blocking people just for dumb comments means you’re removing more and more of an already small user base.
It’s a solution to be sure. It’s just not one that I’d care to use right now when me blocking someone doesn’t actually help what I’m perceiving as the issue that is keeping Lemmy from growing.