i think screen protectors are overblown. i think cases are what people need. when you drop your iPhone 4' down facedown on a flat surface, its not the screen protector that saves your iPhone, its the case and its 1 mm (minimum) spacing according to the MIFI standards that protects your glass. i learned this from watching sapphire screen drop tests.
i was thinking of getting a screen protector. but my warranty provider, square trade didn't charge me a deductible for a new screen on my 6s plus, so why bother.
its cheaper to replace the screen twice without applecare then it is to replace the screen twice with applecare.
applecare comes in handy if you need support, or if you need the phone switched out because of more serious damage.. its the ipad you really need a screen protector / case or applecare on. theres no such thing as a screen replacement for iPads