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Why would you even say this unless you have not read the thread, or have a very short memory, or are trolling?
SDI and PADI both require a redundant source gas, such as a pony or isolated or independent doubles. Some of the thread participant have said they view the surface as their redundant gas source....but that is not compliant to the SDI or PADI standards.
Of course I agree. Aside from agencies, I understand those saying they use the surface as a redundant gas source. I do that because I almost always limit my solo dives to 30' or less. I was taught CESA 10 years ago and do it regularly from 30' for practise. I would figure it's safer to dive to 30' as opposed to free dive there with only snorkel. That could be one nasty entanglement without a tank.
So I do believe personally that depth makes a difference. Of course the agencies, I assume, are not basing their courses on my 30' dives, but on deeper ones. If someone says they can easily do a CESA from 70', more power to them. I've never tried that.