I wonder if part of the reason is that apple deprecated opengl on mac os and replaced it with their property graphics api Metal. I image it would be a lot of work to port the source the engine to Metal just for a small amount of users.
Those look really cool! I wonder what the installation process is like. I installed tannus solid tires on my commuter bike and I like them but they where a nightmare to install. My arm and shoulder where sore for like a week after I put them on because of how much pressure and finesse it took to get the 200 or so plastic pins to pop into the rim. At least I’m confident they will never come off on there own.
As a person who enjoys clean air I approve of this.