[garaetjjte]

That's some tortuous logic. If it helps type faster by keeping the device from jamming, then... it helps type faster. If it only jammed because you type too fast, you could(/must) just slow down, no fancy layouts necessary. It didn't jam because you pressed any key too fast, it jammed when you pressed adjacent typebar too fast, and with proper layout (making sure that common digrams weren't on adjacent typebars) these situations could be minimized.

Weird thing in these discussions is considering that most jam-free possible layout and as fast as possible was somehow different design goal. But, in world of early mechanical typewriters, it was the same! You couldn't have "fast" layout that jammed because it wouldn't be fast, and if you had jam-free layout it probably was fast, because it weren't forcing you to depress each key completely before pressing next.

[taeric]

But only in the sense that my kid's training wheels help them go faster on a bike. Since that only works up to a certain speed.

So... yeah, it is somewhat convoluted, but not as much as you seem to be implying. Take "kids chopsticks". They speed up kids, obviously. They slow down folks that know what they are going.

(Really, I could probably list a huge list of things that all work in this vein.)