I'd say PC gaming is huge, but the subset that cares for teasing out both fps and maximum details like it's 1999, that's tiny, an expensive niche hobby like classic cars (not quite as expensive tough). For almost the entire PC gaming market, GPU performance just isn't a pressing issue anymore. Some games might get a little prettier when you pick the more expensive option when choosing a new system, but that's it, not much of a driving factor in buying motivation.