I'll stipulate that design intent takes the highest priority.
However, there occasions when it would seem best to sketch and model for the benefit of the CPU - minimize rebuild times.
I'm working on a presentation for a user group meeting with the topic of efficiency - when is it best to fillet in the sketch, use construction geometry, eliminate redundant sketch relations, minimize the use of linked dimensions, avoid use of equations,etc.
My question before the forum is, "What empirical evidence and or documentation have you found to support your habits in constraining sketches?" In the absense of insight into the internal code schema of the graphics engine, do you have an intuitive sense for "best sketching practice"?