I suppose it depends on how long you intend on keeping the truck. If only a few years where most of them are under warranty then the CP4 pump is likely less of a concern.
Myself, I plan on keeping my truck for a very long time (likely until death do us part) so the long term cost of ownership and repairs was important to me. I just couldn't bring myself to chance playing Russian Roulette with the CP4 when at the time there were perfectly good trucks with the trusty CP3 (the Ram/Cummins used the CP3 until the new 2019 models came out).