I can only assume you’ve never applied a screen protector to a phone. (-:
This! The plastic ones were a real pita, I’d cut small pieces of masking tape and stick them to the edge, align the plastic protector exactly then very carefully wrap the tape around the edge of the phone as a set of hinges. Then it was relatively easy to lift the protector, clean the screen carefully then drop the protector back down and start peeling the outer film off, all the time pushing the protector down onto the screen, sort of squeegeeing the outer film off. Took ages, but I never got permanent bubbles or dust underneath.
Toughened glass ones are a vast improvement.
Having spent thirty-odd minutes putting a protector onto something the size of an iPhone 4, I’d never, ever, EVER try tinting my car windows, I’ll pay a professional to save myself hours of grief and misery and have a perfect job done.
Personally, I really don’t like the dark privacy tints, it’s impossible to see anything out of the back window, the mirror might as well not be there, I’d choose a mirror film, with about a ten percent tint – all the privacy you need, and still able to actually see outside the car. It’s often Berlingos and Partners, with some other van-type vehicles that have the very dark tints, I guess because they’re carrying a wheelchair in the back, but it really does compromise being able to see outside.