One question that I have found very illuminating to this debate is the following:
Prior to using an AI computer, how many SPGs did you use on your kit? Given that the answer is almost certainly one, why do you feel the need for redundancy now? If one "pressure measuring device" was sufficient before, why are two now required?
That is the question that really got me to drop my SPG. Given that, in my personal experience, AI had been just as rock-solid dependable as my SPG had been, why was I carrying two pressure measuring devices? I couldn't come up with an answer for myself that made sense.
Just something to ponder. I don't consider it wrong, stupid, or foolish to carry an SPG along with an AI computer. Not in the least. Do what you are most comfortable with. But the above question, for me, was very illuminating in my own personal decision making.