So I was just wondering how did people get to a conclusion to ditch the fan and go for Y.
As I see it it would make more sense to have a fan which you could then turn on when you connect V to eGPU and charger. And for playing games you would need U since games are not burst mode type of application.
I imagine that even with eGPU Y and no fan could still bottle-neck gaming performance.
I think that having a fan has no drawbacks to the design if you could control it.
Going from Y to U might, but probably not to much.
Just saying that with fan and U, device could be more capable in different scenarios.