I have been a bit puzzled by the pre-boiling thing. Granted, it will reduce the oxygen in the strike water, but at a strike temp about 70C (to get 65C for the rest), the saturated DO in water is going to be around 5.25ppm. Using typical dosing of SMB, doesn't that give you an oxygen "buffer" of 15ppm or so (according to the literature I was reading)? So, shouldn't you be able to handle the DO in the strike water even without doing anything special. Granted, you will have less O2 buffer for later at that point.
I still don't understand how people are chilling fast in a manner that doesn't agitate the wort. I guess everyone could be using a counterflow or plate chiller, but for anyone using an immersion chiller it seems like it would be hard to get fast cooling without agitation (hence the whirlpool chiller that many of us use). With all that surface exchange of the liquid and dropping temp, I would think that you would use up the SMB "buffer" way before you finished chilling.
I'm not trying to troll, I'm honestly curious about what/why people are doing things the way they are.