No one plays games on a Mac.
And it has nothing to do with GPU performance but rather the fact that the audience simply isn't interested in gaming on it and so there is no economic incentive to target them.
So the GPU performance that matters to Mac users and is relevant to Apple is not games but rather content creation, production etc.
My wife does (I play games on Linux).
I have friends who own Macs who reluctantly dual boot to Windows just to play some games -- they would completely ditch Windows if they could just play every game on Mac.
I see there are Mac games on Steam.
All of this points to the situation being more nuanced than "no one plays games on Mac".
According to the steam hardware survey, Windows is 95%, Macos is 4%, and Linux is 1%. And to dig deeper you'd need to see what games that 5% of the non-Windows is playing - are they simpler games that don't need graphics acceleration (e.g. puzzle games, roguelikes, etc) or ones that do?
My desktop is an Intel NUC running Ubuntu, and yeah I play games on it. Slay the Spire, Spacechem, even some older MMOs like DDO or LoTRO (which run but at 15-20 fps since that system just has Intel Iris). I'm unable to even start many others (e.g. Grim Dawn) due to not having dedicated graphics.
So yeah it's nuanced but lots of games that need a graphics card don't run or even display on that system.
That's why I have a windows gaming system too. I'm realistic, the market just isn't there. I used to have a Mac (dropped it in 2018) and if I still did I'd subscribe to Geforce Now or just do console gaming.
Who says Mac users aren't gamers? It's a self perpetuating vicious cycle: gamers use Windows because that's where the majority of games are, so developers keep targeting Windows, so gamers use Windows, and so ad infinitum.
But people who use Macs enjoy games as well. They would rather not dual boot to Windows.
It's not true that Mac users don't play games. Rather, it's that most games are on Windows, which is a shame.
What I think you mean is competitive gamers and AAA gamers do not play on Apple hardware. This is mostly true today ofc, but keep in mind that's actually not the majority of the gaming market. Apple is raking it in from its gaming market.
I have no idea what the answer is. Personally I have run a number of games on macOS, via Steam, and via Boot Camp and virtualization. Some popular MMOs like Final Fantasy XIV, World of Warcraft, and Eve Online have macOS clients, though Guild Wars 2 discontinued theirs.
Apple Arcade apparently has enough Mac users that Apple has a reason to support it on macOS as well as iOS.
And Apple apparently has some reason to support iOS/iPadOS games on Apple Silicon Macs as well (though it could just be a side effect of a future iOS-macOS merger or hybrid device.)
...and how many would play more games on their Macs if they were available?
I refuse to believe Mac users are less fond of videogames. Based on my personal observation of the Mac users I know, they enjoy games as much as anyone.
At least casual games on iTunes for the iPad have a vast library, with many genuine good games (source: me, my iPad 2 was mainly a gaming platform for me, never found other uses for it).
I do realize more complex games are a different beast. But casual? I'd say Apple fans love them.
Video content creation specifically is where it mostly achieves what the graphs indicate, and that's mostly a "well yeah, video decoder ASICs are really efficient. I'll take things we already knew for $100, Alex"
If the software is optimized, the graphics hold up fine.