And most of those pretty weak arguments aren't fielded much, or are distorted versions. For example, no one (I know of) says the tablets shouldn't have PIM because they are not PDAs; they say that Nokia can't see PIM as an important goal to throw resources at because they are not intended as PDAs. Very different.
My main way of minimizing demand / excusing absence: "Hey, I don't use a PIM. If you want one, go write one, go march on Nokia HQ, or go whatever, but count me out." Usually, I express this by not posting directly on the topic;
One factor seldom addressed is that Nokia's applications generally have a tendency to be annoying and awkward to use, largely because of their UI spec. Therefore it might be better not to have Nokia produce a PIM, but pay a developer to work on an existing project (GPE, perhaps) outside the UI restrictions... (i.e. "throw some at a developer working...", as you said.)