Computer Keyboard: Function Keys as Rubber Buttons

you know how some keyboard have button-style function keys? Look at this pic:

keyboard with button keys

Imagine typing on this keyboard. Here's another one:

bad function keys-2
Worst example of function keys. ① Continuous row, no group-gap. ② hard-to-press cheap buttons.
Kinesis keyboard function keys
Kinesis keyboard function keys. img src

Moral: don't buy keyboard that has the {F1, …, F12} keys in non-standard shape or form. The worst offender here is the Kinesis Contoured Keyboard.