I'd also say that a lot of it is due to the various downfalls of early access setups on Steam. I've noticed how a lot of developers, even well meaning ones, will end up losing steam and motivation on a game once the bucks start rolling in and they go into maintenance-update mode, where instead of fleshing out the important details they cater to audience requests for pointless fluff and regular rounds of new "content".

It also didn't help when Steam ditched their Greenlighting system for the Steam store. Since then it's been an absolute nightmare trying to sift through all the absolute trash on the Steam store, no matter what kinds of tag combinations you employ. This also happened to coincide with the mobile-gaming industry's rise to relevance. Fucking shovelware.