Just explain to me one thing. How is the Playstation 5 going to be "better" than the current Xbox One X if it's also going to use a Vega GPU?HAHAHA yes wouldn't it make so much more sense to try and sell $2000 playstations, that play the same games developers will be targeting to run smooth on PS4 hardware for years after its release.
Nintendo could go Tegra cause they where building a Mobile+ gaming console... and they are Nintendo. Their games are 90% in house and designed to be good games not 3D effect demos. As development was in house and their own teams had made plenty of ARM compiled titles for earlier systems it likely wasn't a big conversion for those teams.
If sony goes ARM+Nvida. Developers have to now target 2 complete different architectures. Sony could build GNM tools to make that seemless for average PS developers... for the higher end PS developers that use GNMX (their lower level API that allows direct control of hardware) Sony would be doubling their workload.
Tegra is not equal remotely in terms of horsepower to an AMD Ryzen/Vega APU. And there really is no way in hell Sony is going to shove a GPU into a console that even if they get a smoking deal from Nvidia would DOUBLE at least their production cost.
I get it you love you your nvidia. Still I think you need to be a bit honest with yourself. In the Mid range where Sony is buying, between NV and AMD... AMD wins. That isn't likely going to change when NV releases their new cards either. The reason miners have loved AMD so much is simple their cards are more powerful, and operate at low voltages very well... and Sony has done a really good job harnessing that with their GNM APIs. Nvidia in PC land has done a really great job of paying off developers, I'll give them that... sometimes I really wish AMD would get their evil on like everyone else. (joking about that last bit)
Perhaps you haven't seen that the Xbox One X isn't selling well. You mean to tell me that Sony's going to essentially release the same thing under their own brand and expect it to do better? How and why exactly? Because it has a Ryzen CPU instead of Jaguar? LOL.