The Devs seem lazy for as much money as they're making. Not to worry the Nvidia Geforce Pro runs the game from your steam account its not laggy and works great on my MacBook Pro. It's allowed me to play 5 PC only games on MacBook.
I had a similar issue. I overcame it using Nvidia GEforce Pro software. It allowed me to play it on my MacBook Pro. works really well. Theres a free version and an $10 a month version.
