It's simple, if Nokia includes root out of the box they'll have to deal with a lot of bricked devices by noobish users.

This has got to be a primary concern for Nokia, I agree. Ultimately, they're delivering to consumers a product that enables them to perform a set of tasks. Certain users will be curious and start poking around. If they stumble onto something inherently hazardous, there's a chance they will shaft something, which amounts to increased support pressure for Nokia. I understand their desire to limit 'privileged' features from a pragmatic business standpoint.

Sooo.... ubuntu should remove sudo?

Nokia's business considerations are radically different from Ubuntu's...there's no legitimate game of tit-for-tat to be played here.