I have one of these (albeit from Braun, not AliExpress). The high-power pulsed laser does actually wear out eventually, so they're hardcoded to stop working after several hundred thousand flashes. Yeah, the hard cutoff is a bit of planned obsolescence, but I've been using mine regularly for 3.5 years and it hasn't run out yet.
Also, the skin chart is some accidental racism. These only work best if you have light skin and dark hair, so that the laser light is absorbed by the hair follicles, damaging them. If you have skin that's too dark, too much light will be absorbed by your skin and probably burn you. If your hair is too light-colored, not as much light will be absorbed by the follicles and it won't be as effective.
I've only been told to turn T-shirts or garments with dangling bits inside out, so that the friction of rubbing against the other clothes doesn't wear off the print.
I don't really see how turning stuff like hoodies inside out would affect anything, apart from maybe preventing the button/zipper from clanking around in the dryer (which admittedly IS very obnoxious)