"Mechanical keyboards" like these are not very mechanical. I've overhauled Teletype machines with real mechanical keyboards. You can only press one key at a tim

"Mechanical keyboards" like these are not very mechanical. I've overhauled Teletype machines with real mechanical keyboards. You can only press one key at a time, because the encoding mechanism pushes back if you push two keys at once. When you press a key, it briefly locks down during the scan cycle, then releases. Typing is speed limited, and it's like playing a piano at a constant rate. An original IBM Selectric keyboard has the same lock-down properties, but allows one-key rollover. Nobody replicates that, although the Selectric was once held up as the gold standard of keyboards.