I've never had a single issue caused by shovelware games on Steam. I've never been spammed by them, I've never had a hard time finding good games, I've never had a hard time filtering games, they don't hide good indie games. It doesn't take much time for enough reviews to accumulate for us to know exactly how good a game is. It's the best review system I've ever seen. I feel like I live in crazy land where everything is pink and happy and some of you live in evil fire land where you can't find a single good game when you filter by user reviews.
Let all games(except illegal stuff) get in in the hopes that they find their public. If you hate a game, don't pay for it or refund it. Hell, maybe some people actually like shitty asset flips. I know youtubers and streamers make a lot of money out of them.