If you're a serial entrepreneur trying to get rich, or maybe a corporate product manager trying to get a juicy bonus, ya you'll have no clue what the users want because you'll be forcing it. But if you are one of the users you are very much aware of what your problems are and what might solve them - even if you don't have whatever domain experience is necessary to solve them.

I agree with your overall point, that things are worth trying even if they don't inherently scream success. But that doesn't mean we need to try everything and abandon common sense at the door. In this case I don't think Stadia defies common sense, I think it defies consumer benefit: gamers should own the games they buy, freemium services powered by ads are dubious, and products which need to be advertised dishonestly to sell well probably shouldn't be sold at all.