I get what you're saying but I don't think it's about gamer focus so much as just gaming in general.
I wrote this on another article comment but I don't think it's just about Google not understanding gamers, but gaming in general.
- People who play games are fickle and distrustful (and rightfully so, cause gaming in general has a sordid history of screwing the player-base repeatedly). Google didn't understand this and seem to have understood it as "built it and they will come", ignoring the handful of failed consoles that claimed to revolutionize gaming
- People who play games are fiercely fanatic towards specific games/platforms (that the console wars still continue is very strange to me; preference sure, but the outright militant approach towards different platforms is just silly). Google didn't understand this and thought it would be enough to just put platform out there and everyone would switch over
- Developers understand the resource allocation for making a game pretty well, and they constantly are missing deadlines and/or releasing half-baked games. Google didn't understand this and just released a platform that was costly to port to and might as well have been another console
- The games that were the showcase of Stadia were not games you want to just pick up and play on the go, they're something you sit down and put a few hours into. Google didn't understand this and apparently just thought "well, AAA game X is popular, let's get that on our platform"
- Google already _has_ a platform for gaming called Android, and they didn't seem to understand what makes it work and what doesn't, or how to use that as a base for their idea, and instead tried to make a whole new platform
- Stadia was a new gaming platform no matter how you slice it, but Google seemed to have the idea that Stadia was just something everyone would love and convert to immediately no matter how complex it was to put games on it. Developers even as late as 2022 still had trouble porting games to Stadia and if it's hard to port, naturally they're not going to develop something specifically for it
The list can go on, but really Google just didn't understand what they were trying to do. The tech was pretty neat, but they didn't understand that what they were offering simply wasn't the way people wanted to play games or develop games for.
Combine this with the fact that _everyone_ (devs and players alike) knew that it had a limited window to be successful before Google shut it down due to lack of $$$, and not having a strong showing from day 1 was not even a nail in the coffin, it was shoveling dirt atop the platform the moment it arrived.
Google was never poised to disrupt gaming in my opinion -- what they were poised to do was to provide the datacenter and audience for developers to create their own vision of what Stadia should have been, but Google tried to make a video game platform, and instead made another entry in the "Failed Video Game console/platforms" lists that will be content for Youtube in the future.