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What are you thinking about specifically?

With regard to Objective-C's ability for weirdness? Its dynamic nature could easily lead to really weird/surprising process flow. It seems like lots of developing Obj-C programmers know about method swizzling but I wouldn't necessarily expect a similarly-experienced C++ programmer to be familiar with such things in practice.

On the conventionality side: Cocoa is known for its consistency in naming and behavior.

Swizzling is a weird one in the community. But if I see #import <objc/runtime.h> something has gone wrong (you have to include that for swizzling and other seemingly dangerous stuff)

I think it's perfectly fine for meta-level code.

Such meta-level code should be encapsulated well and be very useful.

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