It will change the screen quality slightly, though I like to think of it as free anti-aliasing

Though here you go friend, I used their steamdeck protector, though I’ve linked the switch one

In my experience they do affect the picture quality a tiny bit, but the sacrifice is balanced by not having a glare on the screen any more. What country are you in? If you have access to Amazon just try searching “Nintendo Switch matte screen protector”.