Correlation between weight and "quality" build

I suppose some of the factor is how you define Quality?

If you focus solely on initial build defects, then it seems like any of the makers can have a bad day/week/team. But then once those things are ironed out, other factors can come into play.

If you measure by durability, I think some design choices aimed with that goal in mind could lead to heavier components being used. You definitely see that on threads where people discuss frames (usually Lippert versus in-house built).