Apple's Graphics Performance Claims Proven Exaggerated by Mac Studio Reviews
techpowerup.com
techpowerup.com
Most popular games used in a typical GPU review... simply don't have native versions to compare.
If Apple wants to look better in these reviews, they'll need to put some effort into getting native versions available.
(And yes, I understand it ultimately falls on game studios, they need the support from Apple to make it happen. Whether that's financial incentives, available libraries, or marketing that creates a market for gamers buying Apple products.)
I don't believe they care to do better. They put out the marketing claims, which is enough to capture the attention of future buyers; by the time actual benchmarks come out, attention has moved on. There is no incentive to 'doing better'
The GPU case is essentially "Apple said that the GPU is faster than the 5090, and it clearly is not". I get that it uses less power, but you're showing graphs of the actual performance in these comparisons, not the performance per watt, and it sounds like the achieved that essentially by cropping the y axis.