That way the technician would be more mechanical focused with the turrets, armadillo repair and weapon repair. Having the healing ability seems like the odd one out of his current skill set, to me at least.
Really seems like a “test mix up” class. I would expect him to be able to repair Armadillo or turret, but stunning and heavy healing I find kind of stealing from, like you say, medic class / skipping to introduce advanced medikit or more fillings / just testing stun in game before stun weapons are introduced.
Games arent supposed to be logical, but having same heal and animation for fixing a human and a machine is a bit strange. Unless they are mech cyborgs 
What of our concerns, ideas and askings will end in next betas / final game - remains to be seen.
Hopefully some if not most, those that are good and doable!