Well I mean it made it however long (plenty of years) so I wouldn’t say it’s really a fail point. My guess is the blower motor is an odd design that requires the power to be grounded like that. I personally have no idea but I’m certain it’s not for no reason wired like that. But since you won’t ever be plugging anything into C213, you could certainly leave it how you made it (disconnected from diode/ground) and call it done for good if you wanted to.