Its a pointer with a vtable, it wont make a difference in like 99.99% of cases. You very very likely use them because a lot of libraries use them, Box<dyn Error

Its a pointer with a vtable, it wont make a difference in like 99.99% of cases. You very very likely use them because a lot of libraries use them, Box<dyn Error + Send + Sync> is very common. I used to care so much about this stuff then I learned to not give a sh*t and Arc<dyn Trait> to get stuff done. If you use a service oriented architecture with interfaces to reduce coupling this is the way.