However, if usability tests found that the base system could be operated without users using (or possibly even being aware of) a help system; spending the resource to develop and maintain the framework and the documentation is a hard decision for Nokia to take.
Certainly, on the N900 the over-simplification of the UI means there's nothing I've even referred to the manual for (I've not even opened it). I never looked at the help on a 770, N800 or N810 either; and my wife's never looked at it on her N810 AFAICT.
I think the rationale (and there's a thread about it on maemo-developers when the first Fremantle SDK alpha was released without osso-help) would be that the system and its applications should be so simple to use that providing an online help framework on the device is unnecessary. Complex applications can link to online help if they wish.
Indeed, an unfortunate side-effect of Busybox being very lighweight. But, the command line doesn't lend itself to experimentation on the device; and man pages are a separate issue to GUI app help frameworks (although you could argue [incorrectly, IMHO], that the absence of both is symptomatic of the same underlying assumption).
Well, depends how quickly you want your rootfs to fill up (before the problem goes away in Harmattan)