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If you're well trained, highly experienced diver, you don't need anything but a tank, exposure suit (if dictated by water temperature), analog depth gauge, analog compass, a timing piece and some slates with your dive plan written on them. You don't even need an SPG when you equip your tank with a J-valve. You don't even need a BC if you were to weight yourself correct.
Heck, vintage divers do it all the time.
Computers, any sort of computers, are far from necessary.
Yet somehow the regular computer users kept telling us that AI computers are unnecessary but the regular computer is necessary.
Well, I use a computer, but it's in gauge mode. I'd be just as comfortable with a watch and depth gauge, but I enjoy some of the features of the computer. I'm also an instructor and know I can't expect casual divers to dive that way. Computers aren't necessary for anyone, but they make things easier.... much easier.
AI is like having a light on your watch to tell you when the sun is out. If I've remembered anything I've learned during OW about dive planning, I'm going to have a pressure planned at which the dive ends. If you need a computer to tell you when you hit that pressure, are you going to have the SA to sort out the wheat from the chaff when your computer fails?
These "calculations" you seem to dread are basic 6th grade pre-algebra, at worst. I guess that's an issue for some and those people would likely be well served diving AI. So, I guess there are some valid reasons I hadn't thought of for going AI.