Even if they don’t make up 1% of Steam’s catalogue (though I doubt that figure), they have had real impact.
It’s ok to not like them personally, but to say no one cares is disingenuous. Balatro doesn’t require much in terms of hardware but is having a real moment right now. Stardew Valley has been killing it for 8 years. People have thousands of hours in Rimworld.
Indie games are also great for community and modders.