I have a few comments regarding this topic. First, as to speedy key presses, I have often wondered why we don't see flip-flops employed to remove all need for key press sampling.
Here's a set of examples of debounce circuits:
https://circuitcellar.com/research-design-hub/design-solutions/how-to-eliminate-switch-bounce/As it states under method 2, 1, 2, and 3 provide immediate output with no debounce delay. My only guess is that the components needed for these circuits may make the board too expensive, though I would think Hall effect sensors would as well.
Regarding the Hall effect switches, there was a guy on the Reddit forum, and he has a Youtube channel (I forget the name) working out how to make custom key switches using magnets to simulate tactility. You could customize key travel, bump placement, and actuation force with those. Then since he already has magnets, he simply added Hall effect sensors to them as well.
One of the most interesting things about using Hall effect sensors to me is that you can make the key analogue instead of just a simple digital on/off switch. I could have linear switches on my arrow and page up/down keys, and the further I press on them, the faster the web page scrolls.
A final point to make. I think if you buy Gateron or other Hall effect switches and put them into your existing keyboard, you will not receive the speed improvement. That's because the firmware in the keyboard still thinks it needs to sample the key for debounce purposes. I imagine the Wooting keyboard would be designed to not even have to worry about debounce, and maybe there is existing firmware in QMK or elsewhere that supports these kinds of switches.