Nintendo Switch is like 397 Gflops though (docked) and ONLY ~150 Gflops when handheld mode.
Asking Microsoft to make a handheld thats like x 40 times the power of the switch? thats not realistic.
With the higher clocked "boost" mode, undocked the Switch is 192 GFlops.
So a x30 increase in power 4-5 years later... yeah not even close to possible even at double the price.