I use a Spigen EZ fit glass screen protector on both my iPad Pro 12.9 (2021) and 12 Pro Max as I don't like scratches no matter how small they are. Doesn't effect how the device feels or looks at all, plus it gives me piece of mind that no matter how rough I may treat the protector it can be quickly replaced while my screen remains in pristine condition.
As for my iPad the Apple pencil 2nd gen works flawlessey on it, no issues whatsoever with sensitivity or accuracy. Never understood why some say they hate the feel of using a glass protector as the device your touching without one is glass as well.
And no matter how careful you are there will usually be tiny micro scratches on it under the right light, these are usually very visible under sunlight so no need to shine the device under a bright lamp at an angle to see the scratches.
I'm extremely careful with my devices and even then the glass screen protector on my 12 Pro Max almost one year on has a very tiny micro scratch that is only visible at the right angle, but at least if I wanted to I can swap that out in seconds cheaply enough for a new one.