Yes, that makes sense. Small icons can need different artwork to remain clear, especially in Windows title bars.
I’ve logged a feature request for this. The approach I’m planning is to keep the current single PNG as the default, then allow optional artwork for individual sizes. Studio would automatically generate any sizes you haven’t supplied. I also plan to support importing a multi-resolution .ico file.
The supplied artwork should be used consistently by running apps and by built and published applications.