I dive within AI computer along with an spg as a backup. I've had my computer, but never the transmitter, fail during a dive. Definitely a pain.
I understand the "extra fail point" argument in theory, but I've never heard of a transmitter blowing under water, so I'm not sure I buy that.
The best argument I've heard from some tech divers is that once you start getting into stage bottles, deco bottles, etc, the cost of a transmitter for each becomes prohibitive.
In the end I think it's a point of preference and what each person is comfortable with. For me as a recreational diver I like having the transmitter, but won't be getting rid of my spg any time soon.
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