Well thats my thinking.
But i see increasing amounts of lists/advice without holofields simply because of the cost...
and the "more likely to get a weapon destroyed" ... which is marginal at best, and the tank is still alive after all.
But cost is very important... seems anything worth taking usually ends up costing alot.
I've started running two, one with holofields and one without.
The second simply hides to contribute to the first most of the time, hence earning me that S6 AP3 large blast.
It seems to work against MEQ armies atleast.