Yeah i say try fix it, it is definitely noticeable once you get it back.
Might as well whore a picture for you, this was a recent tune on my R33. We were trying to find the best place to have it switch off, tuned it all the way with it on, then all the way off to see where the curves intersect. Run out of fuelpump hence why they dont meet in this curve
As you can see there is a substantial difference!
But, once the fuel was sorted, in my case it seemed to make the most difference in torque and power switching off at 4900rpm.
The other thing we changed was, we set it so it wont turn on untill the ECT is above 50'C. Cos when the car was idling it would click on and off and f**k with the AFR's and ignition. Im unsure if the stock ECU does a temperature activation too? Im guessing it might seeing as its oil operated?