This is true, but unfortunately, a lot of games are almost completely unmaintained, especially on macOS. Many of the smallest indie game developers don't even own Macs—they either borrow their friends' machines to do one-off builds, or they use cross-compilers and rely on fans for testing.

Even just recompiling the game might be a challenge for a lot of developers in the "long tail" of the Mac game library.

This is my sentiment as well. A twitter summed it up nicely:

> the notion that every developer of every app is part of the constant, incessant update loop that Apple encourages is fundamental to the problem. Someone's super personal narrative unity game from 2013 is not getting updated!

[1] https://twitter.com/MammonMachine/status/1181327259057082368

Unity 5 came out in 2017 and it's not supported on Catalina.[1]

So devs of two year old games will need an old macOS install that can export their game to 64-bit, but also a new enough macOS install that can notarize their app (maybe these can both be Mojave -- but many indies don't own their own macs).

Also, Unity 5 is no longer available for purchase. If they're already using their license on another machine, they'll have to migrate it to these macOS installs.

Devs could upgrade to a more recent Unity and fix all the bugs, but to what benefit and at what cost?

[1]: https://forum.unity.com/threads/installing-unity-on-macos-ca...