Did you notice that in another thread the OP here expresses curiosity about the Blue Hole in Dahab? I guess you're right--some people are just fascinated by depth and seek challenges. That's fine. Others, like me, seek to find the combination of technique and equipment that will make our dives as easy as possible so that we can see and be near the kinds of things we enjoy experiencing. I want the maximum visual/perceptual experience with the minimum of difficulty. I don't find freediving of interest, for example. Scuba gear has made it relatively easy and safe to get down to places where it's like sitting in the middle of an aquarium for an hour. To each his own.
Dahap, Blue Home, not my confort zone, far more with just one tank, 50m staying inside NDL no problem, doing a small Deco no problem, but it may sound deardevil but there are conditions that need to be in plase, those already mention, since most people are not willing to do that, I will need to get my training thru most of the Tec courses.