They're really not -- Mac scissor switches are pretty delicate, and it's easy to do damage to the tiny plastic nubs on the keycaps or the switches... and if you damage the metal retaining frame in any way, you're toast (Mac laptop keyboards are virtually unreplaceable, being buried in the "bottom" of the unibody chassis).
nomel|2 months ago
I've swapped ~579 keys (6 MacBook keyboards, and one magic keyboard) with exactly one broken plastic bit from the very first key tried, before looking up the youtube video on how to do it. Damaging the metal retaining frame is impossible when removing or installing them appropriately, so the technique you used was very very wrong. They're easily and trivially popped off and on, if done right. Great care is not needed, with the whole processes taking me around ~10 minutes.