Hyper Light Drifter, Pillars of Eternity, and Dark Souls are all commercial, what? They're made to be enjoyable, playable games that give you a certain number of hours of entertainment that you want to pay money for. Monument Valley is still more towards commercial than artistic, but it could go in both because as I've said a dozen times in this thread, it's not mutually exclusive. Flash games? Well if they're not trying to be commercial games, if they're not intending to get your attention and get you to play them for the fun of it and entertain you, then they're artistic. It's not about whether something has "artistic merit" or whatever BS arbitrary measurement someone wants to try and put on it, when it comes down to it, it's about whether a game is trying to be commercially viable or not. But I thought that would be a more confusing way to phrase things because I figured people would get less hung up on commercial vs artistic than commercial vs non-commercial.
Your initial post did not say that you can have both, and your opening paragraph explicitly states that you think these two are in direct conflict. When I made this post I did not see your post where you elucidated that in your proposal they would not be mutually exclusive.
If the system works in this way, then I've got no strong philosophical objection to it. My only suggestion would be to have "neither" as an option in addition to "both", since I think trashgames would pretty comfortably fit in that category.
At this point my real critique would be that I don't know how effective it would be at addressing the problem you're trying to address. The artgames tag already exists, so if the problem is that you're having a hard time finding art games, then how would adding a different way to tag your game as an artgame fix the problem that people aren't tagging their artgames as artgames?
And what about the backlog? The majority of content on any free-to-upload platform is going to be hit-and-run uploads, stuff that the original creators are no longer maintaining, so probably the vast majority of games released before the new feature is introduced will never be updated to use it.
I'm having a hard time understanding what the problem even is that you're trying to address.
My bad, I've edited the post to better reflect that point.
As for the problem I'm trying to address and how this would help, as I and others have said in here, trying to find games that are trying to be commercially viable and entertaining vs games that are explicitly non-commercial and experimental is difficult. Yes I could use the artgames tag but 1) it's a vague enough term that many games that are non-commercial don't fit into it, or are on the blurry edges, and 2) it's not prominently displayed anywhere - you'd effectively need to know about it to use it, and 3) You can't negate tags in the itch search, so you can't filter out the games that do know about the tag and have decided they fit in that category if you're looking for commercial games.
By making the tags prominent and official, it makes it significantly easier for a newcomer to find a jumping off point and funnel down to the games they actually want, instead of meeting resistance when they just want a fun FPS and have to wade through a ton of 7DFPS jam games, and vice versa.