You know what causes those blower control modules to blow? lack of air, many people do not realize they even have a “Cabin Filter” and that when it plugs up their is a reduced amount of air cooling those heatsinks. Thats why they are in the air plenum, what GM or others really should address is a sensor letting the owner know when the air restriction reaches a certain point.
I try to change mine at least once a year and half way at around 6 months I take them out and use compressed air to rid them of the heavy particulates, they plug up faster if you are a smoker of course.
yes you can just go without one but in the long run you risk plugging up the heater core with junk.
Electricity?...............8^)
With all those damnable stinking diesel powered trucks you need a couple of in cabin filters.