Because it's not that big a deal.
Like I really need to reiterate this: Goblin Slayer isn't that big a deal. It's certainly bad, but its persistence as a topic on SV (and some places elsewhere) is largely the result of competing siege mentalities. Its popularity last season stemmed mainly from the controversy surrounding it. It was so talked about because people were turned off by it, and as CrunchyRoll were strongly promoting it that just put in front of a lot of eyes.
However its actual impact as a piece of pop culture is basically nothing. It was a widely watched seasonal anime and that's basically all its ever going to be. It's part of a current trend in light novels and light novel adaptations, and that trend will end. Goblin Slayer, Shield Hero, Arifureta, these things will be popular in the moment but won't have lasting impact. In ten years we'll still be talking about Berserk. We won't be talking about Goblin Slayer.
Or rather, we won't be talking about Goblin Slayer so long as you can all get over it.