Interesting information, thanks for sharing. From the perspective of someone with 15 years experience with DWC, RDWC is more expensive to build and run for the same results.
Airstones provide cooling (when the pumps have access to cool air) and turbulence which keeps the reservoir evenly mixed. They also seem to have provided sufficient DO to produce extremely impressive grows, for a few decades. It's also ridiculously inexpensive to set up and run.
I have yet to see anyone publish a full size DWC or RDWC grow, from start to finish, at 82F res temps. I admit I haven't read every grow show on the net, so if you know of one I'd appreciate you sharing the link. High (edit: biological activity levels) are much easier to create at 82F, my max is 70F for zero problems.
Good tips on finding O2 equipment, you're right on the money there.