I am in support of the IT having PIM apps on it. And if you are really honest and realistic you'd agree as well.
If you work in a metropolitan area then you don't have to worry about having WIFI access. However the majority of potential owners of the IT will not have that luxury.
Nokia claims to have designed it as an internet tablet. For use on the internet, using always on WIFI or cell phone GPRS etc. If that were so why then include video playback, audio, FM radio and all the other things it can do, which have nothing to do with the internet. Why have 2 SD card slots. It can't be so we can view large html pages.
PIM apps are a logical extension of the device and to not include them would be a great mistake. I have a Palm and the only reason I do not have a n800 is price, it's instability and the lack of PIM apps.
I mention instability, because like most of you I don't plan on using only what nokia provided and the other programs (some of them mentioned on this forum) can cause problems.
If Nokia wrote the PIM chances are it would be stable and the price would be justified. Right now, for $400. I get to play with an internet "under development" tablet.