[basro]

Instead of Arc and Mutex you'd be using Rc and RefCell. Wouldn't it be just as complex and verbose code-wise?

I understand that it is less efficient but in the case you describe wouldn't paying for a few extra atomics be negligible anyway?

[monocasa]

I've found that practically I'm more likely to simply use Box, Vec, and just regular data on the stack rather than Rc and RefCell when I esque Arc and Mutex by using a single context. The data modeling is different enough that you generally don't have to share multiple references to the same data in the first place. That's where the real efficiencies come to play.