It's slowly approaching what SRE has been dealing with for distributed systems... You just have to accept things won't be fully understood and whip out your statistical tooling, it's ok. And if they get the engineering right, you might still keep your low latency corner where only an understandable set of things are allowed.
If open source projects like Slackware Linux can keep it stable on zero budget with a zoo of components since before we knew what SRE was, then Apple can afford to have operating system specialists who know the whole system. It’s like they gave up and welded the jukebox closed because it was making enough money.