I don’t have a problem with the reflectance - each to their own.
My problem with screen protectors is that they’re designed for glass. Glass doesn’t off-gas like plastic can.
I did a job in 2004 for a big American film company that involved shipping polycarbonate plates with graphics attached to NY from the UK. By the time they reached NY by ship (yes in the middle of the container stack), there were thousands of small bubbles between the PC and the graphic. I’m reliably told this is because certain plastics are still curing and emit tiny amounts of gas.
Glass doesn’t need to off-gas.
Hopefully this isn’t an issue with this type of plastic.