I just researched this but a welding torch will repair 10 health per second (a hawk has 100 total fyi) but an arm only does 10 health every 1.6 seconds.
I know nerdy and waste of time but to but that in perspective you can heal a hawk completly in 10 seconds with a repair gun and 16 with an arm.
Hope you find this interesting:
Its not a waste of time for the repair oriented players! Good observation sir!