Some fights have burn phases, sure, but not all. We still run NiM EV/KP for comms/titles for our alts and most of those fights are a bit more straightforward. If there are circumstances where the proc relic is better, which you yourself have stated, then it isn't "utterly horrible", it's just situational.
And sorry, I wasn't asking for the power relic vs the proc relic, I was asking for the proc relic vs the matrix cube. 28 DPS is a fair estimate for Relentless Winds (my parses have shown between 26-30). I don't yet have the Campaign proc relic to test, but obviously it would be slightly higher. Do you have any math showing the approximate DPS of the matrix cube?
I'm not trying to bust your balls or anything, I just can't bring myself to take somebody's word for it without data