What caused the car to be dead? My guess is it was the issues you described as being new. What dash lights? These could be caused by low voltage. I’m guessing that something broke on your ignition or there’s a bad relay causing power to go to the heater controls. This is what caused the battery to die initially.

ETA: Not waiting for the booster to be ready usually results in low or no voltage being available for the jump. It probably wouldn’t wreck anything.

More likely is that the parasitic draw was what caused the car to need a jump. Is there an aftermarket stereo or other electronics installed?