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Most of your OS is not open, so why bother? That's like spraying perfume in a room full of skunks ...

It's about expected levels of risk and the level of risk you're willing to accept.

e.g. Risk of Apple deploying a malicious binary: low [0]

Risk of J Random Dev deploying a malicious binary: higher, after they plug in a Thunderbolt adapter they found laying around at 32C3 [1].

So you might be willing to accept the risk of using a closed source OS, but an app doing interesting low level (?) things to the OS? Maybe not.

[0]: Yeah yeah, the NSA is going to force them to deploy a bad copy of XCode, I know.