Whenever this topic comes up, we always get a lot of posts from divers who say things like "I have NEVER had a problem with my wireless AI, so I feel that there is no problem with anyone using it".
Let's assume the failure rate of wireless air integrated computer is, say, 20%. That would be ridiculously high and unacceptable, but assume the worst for this thought experiment. Also assume that it's a failure rate per unit, not per dive (that is, if you get one of the bad ones it will fail regularly, but if you get a good one it will work whenever you dive it).
That means that the vast majority of posts (80%) are going to be people who have never had problems with their transmitters, swear by them, and feel that an analog SPG is unnecessary.
Now, I don't actually know the failure rate of analog SPGs, and that would be good information to have. But I would be very surprised to learn that it was actually higher than the failure rate of wireless AI. Of course, I am always open to learning new things!
Mike