I don't think it's a good thing
Cuz in the previous updates, there was a feature, if someone other than mechanic, attempts to fix your vehicle, he might fail
But if mechanic attempts to fix it, he do it well without breaking it
Eventually his job to fix it rather than destroy it and get a level wanted as a felon, and may he didn't mean to kill you, but the system make him intention so, while otherwise he's innocent, -1.
IF you try to fix your own car with an engine repair kit, there is a chance you would fail at it and the game calls you out to call a professional instead.
It´s not right that a proffessional is gonna wreck your car too.
Nobody can escape their sins, everyone gets punished whether it takes a day or an eternity.
You can change who you are, but you cannot run from yourself.

This would just discourage people from using the mechanic.