603country, all you've said above is true. . .except for one thing.
Barrel weight, or how thin it is, has nothing to do with accuracy. Each barrel has the same fundamental frequency it wiggles at plus the harmonics that are multiples of the fundamental. With equal bore, groove and chamber dimensional quality they'll bot shoot with the same level of accuracy. In other words, barrel weight, thick or thin, has nothing to do with accuracy. Period.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master