interesting points raised. However think of it this way:

You don't need a car, but yet more or less every family in the developed countries have a car, because you can drive.

Same applies with the N900 & Nitdroid.

You don't need Nitdroid to make the N900 work, but you can install Nitdroid on your N900?.. it's bout being able to carry out a task... and in my opinion its great being able to run 2 OS's on a 'mobile' device..

I mean there are loads of things that are not needed, inc. taxes, poverty and war... But you still find them around...