[throwit1979]

or else you'll soon get pain from the low travel.

Huh? I am wracking my brain trying to figure out how, biomechanically, a short keystroke can cause pain.

[nvarsj]

Because you bottom out. With some practice, you can use a mechanical keyboard with never hitting the bottom because you can tell when the key engages (e.g. with a click or change in pressure). Some people believe this can reduce stress on the finger.