I have tried, I really tried hard to make gaming on Mac work, it just doesn’t. Of a 100 AA+ games only ~3 are supported on Mac. I tried to find a shooter and strategy games. The ones you find on steam have or very poor performance, are old, or have no online player base. The Mac’s are great computers but claiming that they are for gaming is plain stupid and Apple should stop misleading their customers."Not a thing" if you ignore the thousands of games available. Here are 43,000 options on Steam: https://store.steampowered.com/search/?os=mac
You might not like any of those thousands of games, but I play some of them. I didn't buy my Mac for gaming, but it does well when I play games. I think people saying they can't game on a Mac really mean Macs don't have some of the games they play.