I had once asked about dual CPU in the old thread. My reasoning was if Stadia can combine CPU/GPU/RAM from 2 single instances into a super instance then why can't chiplets let you do the same thing.
Stadia hardware lives in a server rack where noise, heat, power and cost considerations are completely different. You can build a console this way, it just wouldn't be a very good idea as it would be inefficient. Stadia can use brute force to overcome the inherent inefficiency, because they can always just throw more hardware at the problem even if doubling the hardware allocation is only adding 50% to the performance.