Has Stadia improved since launch? The PS5 and Xbox Series X are both more powerful than Stadia instances, not to mention modern PCs. Has Google announced any timeframe for powering up their instances to match? Will I have to pay more to access instances with the power of next-generation consoles? Will those be available for all the games I purchased, or on a title-by-title basis?
That's the scary thing for some people. The 'continuous improvement' may just as well be taking away stuff you 'own' or spying on you.
Also, money you paid to stadia are just as "frozen" (spent? frozen money implies they can be thawn) as money for online service.
While you can carry chromecast ultra with you it's PITA to setup - you have to configure the network on it and a controller. Without wired connection it's not a good experience. Meanwhile, ps5 you just plug in a play for the most part.
Then instead of $10/m, you have a console for 10 years ($120*10 = $1200).
Even cheaper if you go for the PS4.