R&D is typically - and appropriately - an unbounded, unique, loosely-defined activity. That doesn't mean there are zero processes involved... just that the most significant parts of R&D are beyond the realm of process.
So, when I say that I'm a critic of the process-centric approach, what I'm really objecting to is the misapplication and the overapplication of these approaches.
I also want to point out that I'm not a skeptic of the utility of process-centric approaches in R&D and program management. I'm emphatically a critic. The term skeptic sounds like a person is unsure whether a thing will work or not. Not me - I'm not agnostic about this stuff. I've done my research, taken the classes, got the t-shirt, and came to a conclusion. I'm well beyond skepticism.