The second and third points are unfounded. The Cell is setup no differently than any other processor, and the fact that it supports almost all PowerPC based Operating Systems proves that its no more different than said PPC processors.
Its difficulty to develop for is not because of inherent flaws in the technology, but because its new and requires the learning of different tricks to make things work. As opposed to the Saturn's processors that may as well have been from another galaxy because they were so vastly different in comparison to other processors.
Almost all consoles are 'difficult' to develop for at first, because again, there is a period of relearning involved. This will only be eliminated when console manufacturers start using standard PC CPUs (x86, x64, etc) when making consoles, as the vast majority of game developers know how to develop for these chips.