Multiple stores is great but I wished there was only one launcher. I must have seven installed currently on my gaming PC, each needing updating every week.
Impossible without a store standard.
It would be stupid to be "against" competing stores on PC. PC is an open platform anybody can write any code they want on it. It's just a fact that Steam is the only good one by a mile. As long as all the others are dogshit, games exclusive to those stores may as well not exist.
There was a world before "stores", you know...
There were always stores, physical ones, or shipping.