That is not true at all. Ignoring Mac as a gamedev is one of the easiest decisions we've ever made at every studio I worked at. Even the studio where the boss used a Mac! The market share is minuscule and lacks even the Steamdeck and proton pushing linux support into Steam games.
That Apple saw fit to half-effort this tooling then lock it behind a license which prevents gamedevs shipping with it, and steam from packaging it, means Apple has yet again demonstrated their time tested poor support for games.
Lag time in port availability also probably factors in too. If you open Steam on a Mac you’re shown a bunch of brand new games without Mac ports… if you don’t dig a little deeper it gives one the impression that they don’t have many Mac games and isn’t worth bothering with.
Instead it sounds like you are reaching for excuses to ignore what you wish to be not-true. You clearly care a lot about gaming on Mac. Sadly Apple does not care. Hence how a rather decent US PC market share translates to trivial games market share.
When Apple starts caring they have the money to buy ports. There is no need for excuses.
If you're talking about Railgrade (from your bio), couldn't that simply be because your game only shows as supporting Windows? Why would a Mac user wishlist a game they can't play? Linux users have had Proton for a few years now and the discussed Mac toolkit was only announced a couple days ago.
If the Linux users were vastly out of line, I'd question them. Instead they are inline with the Steam survey. Anyway, the idea that Mac users are not big games is about as controversial as the color of the sky.
Regardless, I definitely didn't mean to imply that Mac users are big gamers. Most Macs are MacBooks and most people don't buy a laptop primarily for gaming. It'd be a secondary concern. There's also a chicken and egg situation in which Mac users may not be big gamers because there's not many games for Macs (not to mention that Steam runs terribly and is buggy on M-series Macs). Any Mac users that are big gamers probably have a console and/or PC (like myself) due to this situation, so any wishlisting is done on the device I play games on, despite the desire to be able to play on the go on my MacBook. Any Mac users that aren't big gamers may be due to having limited games. My wife who isn't a big gamer, but does like to play games occasionally, is relegated to using Bootcamp on her iMac.