I'm not that clued up on the latest generation of AFVs out there but after reading up about the T14 and some of the newer bells and whistles available to AFVs in general always makes me think of a story from my youth...
Picture it, Mid 80's and the Hoggydog family are off to buy a new car. Soon the choice at the local dealer is whittled down to two Rover SD1s. Both are test driven I and my mother are impressed with the Red one as it has a radio cassette player, electric windows and sunroof and is an automatic. The other is a more basic model. Same car but without the extras listed above.
Guess which one my dad bought? That is right the more basic one.
"The more there is on a car, the more there is to go wrong and that costs time and money" were his words.
This works with all things, With all these radars, laser bafflers, hard kill systems and technology crammed into these vehicles you increase the amount of servicing and the level of expertise needed to carry out these tasks. You put more workload onto the crew and you increase the logistical nightmare in keeping these vehicles in a battle ready state.
And the other issue is that much of this tech (sensors in particular) have to be on the exterior of the vehicle and would be vulnerable to small arms/artillery/environmental damage. That stuff is going to go wrong.
Just give me a 120mm rifled gun, some Dorchester armour, slap it on a 30 year old chassis and I will see off any iTank! (it probably will need an OS update before firing its gun anyway!)