I don't remember Apple claiming their GPUs to be of 'workstation' class.
Apple generally avoids using the common PC terminology, probably because this terminology is vague as hell. But MacBook Pro was always de-facto positioned as an ultraportable workstation (price, features, capability).
The game's code needs to be optimized for Apple Silicon.
The first Pentiums in 1993 had their first triple A title like Quake 1 in 1996.
So we may see Apple Silicon-native games by 2023?
The first truly native Apple Silicon game is Baldurs Gate 3, with an early preview available now.