Tech people talk about the tech they killed, but that isn't related to game developers' incentives - especially considering nearly all the tech they killed was free and they don't have a history of rolling on actual customers.
The actual problem for game developers was that the architecture was home-grown (Vulkan-only), with little tooling, annoying licensure requirements, and not enough profit incentive to dedicate the effort. Companies have no (financial) problem releasing for GOG, which has fewer users than Stadia, because you barely have to take any effort to do so, but porting to Stadia took the effort of porting to Xbox. This both counted as a direct incentive not to port to Stadia, as well as the writing on the wall for how well-managed this product would be.
The actual problem for game developers was that the architecture was home-grown (Vulkan-only), with little tooling, annoying licensure requirements, and not enough profit incentive to dedicate the effort. Companies have no (financial) problem releasing for GOG, which has fewer users than Stadia, because you barely have to take any effort to do so, but porting to Stadia took the effort of porting to Xbox. This both counted as a direct incentive not to port to Stadia, as well as the writing on the wall for how well-managed this product would be.