After managing to scratch the glass screen on my Apple iPad some years ago, I now fit screen protectors to any equipment with a display (other than my laptop). Sadly, I've yet to find one that's reflection-free, which somewhat negate whatever anti-reflective coatings have been applied to the item's screen, and some are prone to picking up fingerprints which requires regular wiping - but my own preference is to keep displays in good condition, so these are sacrifices I'm prepared to make.
I've used a lot of different types, but my two favourites are the Vikuiti DQCT130 and Brotect AirGlass. Both are fairly easy to apply without leaving bubbles, so long as you clean your screen first and use a blower to get rid of any dust particles.
As a general rule, thin / flexible screen protectors won't affect touch screen use. Thicker glass protectors - the non-flexible type - might...
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