Remy, there are all kinds of situations where Rescue Training would benefit a diver - and for a tech diver, it's not likely to be body recovery related, either. I'm going to post about this from three different perspectives below.
Finally, sometimes the accidents you are involved with have nothing to do with diving. A few years ago, a kid drowned swimming in a pond where we were diving. After pulling him out of the water it was obvious we were too late although CPR was tried. But if we had been made aware of the situation earlier and just gotten to him five minutes quicker, his life may have been saved. And having a rescue class would definitely be beneficial for that type of situation.
I agree with you, but I think all are missing the point of the video, it is about not becoming the second victim, rule #1 in Rescue.
Like you mention it is not only about diving, it apply to any regular water activities, how in shape are you to do it successfully.
And if one get to do a rescue, it is more for recreational conditions and Lite-Deco's.
Once you get in Tec diving you know you are signing in for a lot of risk involved, where it can come to make those hard decisions on should I surface and play dices or not
Tec diving as well teach you not to enter in those situations or foresee them and press the abort bottom before you get that far, and nobody will ask questions.
Technical shore dives are for the most part far from shore, so there is not only the Deco obligations that you can decide to blowout, is the distance to shore, if it is a Boat dive that makes it easy, yes you may can decide to blowout your Deco, or send the Yellow SMB and hope somebody see it quickly enough to take over and avoid being second victim.
It reminds me of a Dutch/South African diver, famous for discovering the Coelacanth, where his long time buddy ran for the surface ( under unknown circumstances ) and he followed to help her get onboard and try to help with CPR, he died next to her, that was as well a deep dive, with bad surface logistics.
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Going back to the essence of the video
The question is more for the Rec divers and Instructors ( which I see a lot that they don't keep them self to the recommended shape in what a Diver shall be ) they are the ones that will encounter more rescue scenarios than a Tec diver.
I agree with the part of knowledge of the Rescue course, but one lack of fitment can actually contribute too two tragedies, your self and that person that you wanted to rescue, because you kill your self by overexerting you and fail to rescue that person that may could had been rescued if you were in shape, or that you were to slow to get to shore.
How I see it and believe the point of Mark and Tim video is, is to pay attention on your body and keep your self in shape to not become the second victim and be quick in the rescue, and all are missing the point of the video I believe.
Knowing to foresee the problem before it happen, do CPR, bring a victim from the bottom, is the easy part of the course, going long distance and fast enough and then start CPR is another part and the tough one
It's about being the complete package, and do your best to keep your self that way as much as health and age allows you too, in order to successfully rescue a person and don't become the second victim once you go for that rescue.