Interesting. (Skip to 17:35 but watch the whole video later, it's worth it)
The iPhone 15 can outperform the Steam Deck... before throttling 5 minutes later. But it also has AI upscaling. Strangely enough, TSMC's 3nm process didn't seem to give it any efficiency advantage, and it consumes more power than its predecessor.
If Apple can surpass a Steam Deck with passive cooling and get close to it after throttling even on a node that, for some reason, didn't seem to give it an efficiency advantage, it would be easy for Nintendo to destroy the Steam Deck performance-wise at 4nm.
Hopefully it's not actually Samsung's crappy 8nm node. If it is, I expect either a disappointing battery life or a bulky console with sub-par performance.
For context, the Steam Deck uses TSMC's 7nm node.