... Because you can only sieve though so many horror games in popular. Amongst other issues...
In more detail, it would be nice to (temporarily or permanently) filter out some genres, as while I'm sure someone wants them (they do exist, after all), not everyone is always in the mood to scroll by about a billion of them. It would speed of casual or unaimed discovery, unjank the site for newcomers, and make it easier for people to actually find what they want without knowing an exact name. I know there's a search bar and an inclusion filter made just for this, but the disclusion filter would be a quality-of-life addition for those who know exactly what they don't want but not exactly what they do.