I think the person you’re replying to had the right analysis of why that doesn’t match the product they built: not owning a high-end PC, instant install/patching, etc. are a decent pitch but Stadia charges full price and doesn’t credit anything you already own.

I think it’d make a lot more sense if they didn’t charge full price, allowed rental/trial periods, or cut a deal to recognize your existing Steam/Epic/GOG purchases - making it a good deal for people who are traveling, don’t want to fire up a desktop at the moment, etc. – and worked on some unique features like hitting GCP strong points – AI at a new level or massive scaling for things like Sim-style games, etc. — so the value pitch wasn’t so narrow.

A top notch machine is only like 50% faster for 2-3 times the price. You don't need it. You can just get a console or a budget PC for $600. If you are crazy you can spend $300 on a PC and only play dota 2 and 2D games like Terraria, Don't Starve Together or Rimworld.

Also, what makes you think that 5/6 of the world has fast internet? I have good internet but if you asked me 3 years ago I would have said no.

Nah, that's what consoles are for. You don't even need the latest one sometimes. Consoles have existed before Stadia.