I think there has been a shift in what kinds of games get published that privileges a slim set of experiences that are possible in board games and risks narrowing the range of what people think a board game is capable of. I agree there’s a vast range of different player types and psychological rewards people get out of playing games, but I personally find myself increasingly uninterested in new game designs, because the designs I like are harder to sell to impulsive buyers, players who don’t want to play a game repeatedly, or players who will have difficulty playing games again if anyone has a bad time (which I totally get! But it means designs that might prompt negative emotions are not sought by many publishers). I wouldn’t even say “heavy” games are the problem (I disagree with OP about high time commitment being a problem, there’s many games like that that deliver commensurate value to me).