This may get slightly convoluted and may need a separate thread, as it may be deemed outside the scope of the OP's original post:
In a free floated rifle, which may be an elementary consideration in building a long range rifle system, having a greater contact/surface area/depth relationship between the barrel and action, will simply strengthen the overall rifle. This will translate to a more robust and 'rigid' platform, where barrel harmonics and consistency come into play. If nothing else, having a stronger, more mission capable system will translate to more confidence and sometimes that is all that is needed to take a shooter to the next level. Like my friend the badger says "FTE!"
So much wrong with this...…...don't know where to start. Your assumptions about the relationship between the action/barrel joint and barrel stiffness fwd of that point is tenous at best and unless you show some empirical evidence or at least FEA/beam mechanics analysis it's not believable.