A memory leak in Apple's Network Extension framework

I wish there was an independent unit test suite for operating systems and other proprietary software.

The suite would run the most-used apps and utilities against updates and report regressions.

So for example, the vast majority of apps on my Mac can't run, because they were written for early versions of OS X and OS 9, even all the way back to System 7 when apps were expected to still run on 4/5/6. The suite would reveal that Apple has a track record of de-prioritizing backwards compatibility or backporting bug fixes to previous OS versions.

Edit: integration test suite

Huh? In service of what? There’s not all that much inherently good about backwards compatibility, but you’re really implying that deprioritising it is a misdeed. If I wanted to use an OS that prioritised backwards compatibility more than macOS, I’d use Windows, and suffer through the downsides of that trade-off. I’m happy using an OS that balances things in a way that’s more in line with my priorities.