Depends a lot on the screen and environment in my experience.

A glossy Apple Studio Display or iMac (both of which have a decent antiglare treatment despite being glossy) in an office setting for example isn’t too bad.

On the other hand, your average touchscreen laptop (which are always almost-mirrors with no hint of treatment, for some reason) with screen angled up slightly and overhead fluorescent tube lighting or a skylight on the other hand? Borderline useless if the screen isn’t bright enough to outshine the strong glare covering 40-60%+ of the screen.