But that's the thing, you have complete control over templates, there's no compiler magic involved. If you're unhappy with the way a template call sequence gets

But that's the thing, you have complete control over templates, there's no compiler magic involved. If you're unhappy with the way a template call sequence gets optimized you can tweak it completely. In your comment below you mention boost but that's kind of my point: boost is a completely optional third party library, not a built-in construct of the language like the coroutines discussed here. Boost might be relying on the compiler correctly optimizing some constructs but the C++ template mechanics themselves not so much.