Nick, I agree with what you are saying, however, for the fun of technical discussions, the following expansion of your two points is raised; in reverse order.
2) It is appearing that future advancements in electromechanical drives will present new opportunities and require some rethinking.
This is one example of electric cars that have a separate motor in each of the four wheels.
You have noted in the past that Igor waited until the efficiencies of engines reached a favorable level before he went back to helicopters. This same situation is probably repeating today as people try to apply electric drives to the inefficient rotorcraft.
1) 'Disk loading' is a convenient way of evaluating thrust/weight considerations. However, I think that it looses much of it validity when evaluating comparative rotor configurations.
This has to do with the fact that 50% of a rotor's thrust is coming from the outer 25% of it's disk area. IMHO, one of the strong arguments for the Interleaving Configuration is its distribution of the thrust about the total disk area.
A bunch of babbling on this subject.
Dave