It's all a bit of a tangled web...
If you can see exactly what's going on in the car by transmitting a signal back, you already have the technology to send a signal forward - so it's one small step to making adjustments during a race.
In between that and now, it is a very expensive technology that can easily be used to gain an advantage. Knowing your current draw curves, where exactly you are losing time, what the temp is on a motor (especially BL) and what current you are drawing, are all things that remove experience and learning, and replace it with money and reading a set of numbers.
For the gas guys, it's not a great leap to fit a strain guage or flow meter to a fuel tank and do like F1 - know exactly when to come in, or stay out for another lap. That could be a huge advantage, and it would mean all the top guys would have to have one.
We had the same discussion about traction control many years ago, and banned it. It has done the sport a lot of good since then.
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