I very much doubt Switch 2 is going to have more "realized power per a TFLOPS" than Series S or X, let alone PS5. Being more advanced and recent will not make up for downsides associated with its handheld nature. So even when disregarding the deficiencies in CPU, storage system and RAM, I would expect Switch 2's GPU to be less efficient than the current consoles.
PS5's so called "RDNA 1.5" is proven to be more performant "per a TFLOPS" (and per buck) than Series S or X with their Velocity Architecture, ML acceleration, DirectStorage, hardware accelerated VRS, true RDNA2, and other buzzwords. PS5's supposedly inferior RDNA implementation (which was supposed to overheat and throttle to just 8 TFLOPS according to "experts") is literally more efficient according to the real world results.
Even the PS4 with its outdated GPU design and terrible CPU holds its own against the SteamDeck, which also has twice the RAM amount (but lower speeds). Per a TFLOPS, PS4's GPU is more or less as performant/efficient as the much more technologically advanced SteamDeck GPU.
I think some of you are underestimating handheld limitations.
