Alternatively, that same gamer could have just bought the game they want on Stadia and not have any of that hassle to deal with.
Also, I've owned every Playstation since PS2, and I've never played an online multiplayer game on one (with the exception of Journey, which does so silently), nor do I give the slightest damn about achievements.
My point is not that I don't care, or that nobody cares about achievements, it's that not everybody cares about achievements. My point is that Stadia and its equivalents have a place in the market for at least some people.
Also, I've owned every Playstation since PS2, and I've never played an online multiplayer game on one (with the exception of Journey, which does so silently), nor do I give the slightest damn about achievements.