Er...no.
I mean, sure, I believe you that you've seen this. But I've looked at quite a number of iOS/macOS projects and this was never a problem. Not even close. If anything, people were extremely hesitant if not actually afraid of using C features outside of the very basic ones like control structures, arithmetic and assignment.
Doesn't change the fact ARC doesn't work with structs, and people actually allocate them on the heap, hence why on 2018 Objective-C got some support for also applying ARC to structs.
Maybe time to also review the WWDC session and the points made there?
They code mostly in a C like way, and only use Objective-C at the level it is required to call into Apple specific APIs.
When using C++, then their code looks like what I call C+.
The same set of people that are to blame for Objective-C conservative GC never working in practice, when mixing Frameworks compiled with different modes.