Are you using headphones or is it game specific

After doing about five hours of research I can safely tell you your best bet is to pick up an anti glare screen protector.

Will it damage the screen - no

Use any of the well known brands

I just picked up the JSAUX Anti glare for the LE as I travel across the world to places that getting a scratch on my steam deck will be the least of my worries

If you do decide to get an HD or glossy one. It will not look as good as the glossy, and it will remove the anti reflections properties of the etched glass.

Let me ask my ai

Neither is better both have strengths and weaknesses. ROG has better specs but the steam deck is… well a steam deck