Multiple solid reasons have been mentioned from ones created by Apple to ones enforced in software by Apple. One that hasn't been mentioned is the lack of marketshare. Macos market is just tiny and very limited. It's also not a growing market. PC gaming isn't blowing up either but the amount of players is just simply higher.
Ports to macos have not done well from what I've heard. However you can see ports on PC do really well and have encouraged studios like Sony and SquareEnix to invest more in PC ports. Even much later after the console versions sell well. Just not a lot of reasons to add the tech debt and complexity of supporting mac as well.
Even big publishers like Blizzard who have been mac devs for a long time axed the dedicate mac team and client and moved to a unified client. This has downfalls like mac specific issues. If those are not critical then they get put in the pile with the rest of the bugs.
Ports to macos have not done well from what I've heard. However you can see ports on PC do really well and have encouraged studios like Sony and SquareEnix to invest more in PC ports. Even much later after the console versions sell well. Just not a lot of reasons to add the tech debt and complexity of supporting mac as well.
Even big publishers like Blizzard who have been mac devs for a long time axed the dedicate mac team and client and moved to a unified client. This has downfalls like mac specific issues. If those are not critical then they get put in the pile with the rest of the bugs.