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> it can only get slower as it traverses all the other, new layers

We can easily budget a million cycles across those extra layers and it's still, like, a millisecond. It's not the harsh reality of layering that makes it slower, it's problems with the ways specific layers are designed.

Amiga keyboards (at least some) in fact had a SOC version of the 6502 (with a small PROM and small amount of RAM onboard) controlling them already in the 1980s.

No it’s a 32 bit Arm processor most likely. Capable of doing usb and Bluetooth. N-key rollover.