Here's what it looks like when I attempt to alternate between left and right inputs quickly using a PS4 controller.
https://gfycat.com/gifs/detail/DeepWindingAnkole
Note how not a single input is dropped. Note how not a single unintended input is registered.
Here's what it looks like when I attempt the same shit, except even more slowly and carefully, on my Switch pro controller.
https://gfycat.com/gifs/detail/TidyDefinitiveKillifish
It's far, far too easy to trigger unintended inputs on the Switch d-pad. There's something of an easy fix, but it involves taking apart the Switch Pro controller, and the damn thing is more tank-like and more complex than any first party flagship controller I've ever taken apart. You or anyone else would instantly understand why the Pro controller is $70 the moment you take one apart, lol. Its sturdiness makes the DS4 and XB1 pads seem like MadCatz (in terms of build quality) in comparison.