OK, not sure which part was BS. I didn't say that you couldn't fix the o-ring on the boat, I was referring to the only 3 OOG and potential OOG emergencies I have ever been involved in. All 3 of them were pinched o-rings that gave way during the dive, on one of them I came across a buddy pair trying to ascend together while gas sharing and not doing a great job of it. After i assisted them it turned out to be the o-ring
That. I'm sure it really happened but I strongly suspect the problems in all those cases was between the diver's 2nd stage and mask strap.
If your o-ring blows in the middle of a dive (and not when initially pressurized) and you start losing gas at a rate that takes you OOG, you're going to hear it. And your buddy is going to see it. If you don't thumb the dive at this point, your problem is not with DIN vs yoke fittiing.
Yes, technical divers prefer DIN because if that happens to them, they may not have a direct path to the surface and/or may need to make a few stops on the way up. A rec diver in that situation (overhead and/or deco oblication) is, again, asking for a visit with Dr. Darwin.
What you're really going to do with DIN regs at popular rec dive destination in leftpondia is use the adapter and bang your head on it
and have the o-ring.
As far as computer rentals go, out here the dive centres charge for "tank and weights" or "Full gear". a PDC costs around 8$ a day to rent. The BCD and reg costs around 45 $
I'm sure it's true in Atlantis The Palm. This side of the pond a computer tends to be as much or more than either BCD or regs (though usually not both), at least when rented separately and not as part of a package.
If you need to choose between renting the regs or renting the DC, you're better off with the former for any number of reasons including, but not limited to the cost. So the advice to buy regs and hold off on the computer is BS too.