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