Any touchscreen device should come with screen protector included
if a manufacturer find any such protection is required.
Not including accesories like screen protector means exactly,
the manufacturer find any such protection is not required.
So your touchscreen should be scratch-free for a whole of its life-time.
If it's not true you should claim replacement any time.

There is no need to buy any extra accessories delivered by third parties
for a quality product under Consumer Protection Act.
What you pay for and get is ready to use, complete and in safe operational condition.

Violation of Consumer Rights is not providing a consumer with
any and every required accesories part for a normal use.

Darius