Wow, you certainly don't remember the 12" Powerbook very well do you? Firstly, it was NOT pro performance with iBook portability. It was a glorified iBook and nothing more.
It did not have the Powerbook 15" or 17" GPU, in fact it's GPU was only a little better than the iBook. The 12" Powerbook certainly did not have the power of the 15" or 17". It was always several hundred megahertz slower than the 15 and 17". Also the ram max was the same as the iBook.
Also there was no backlit keyboard on the 12" Powerbook and no option for it either.
Also there was no PC card slot.
Also there was no Firewire 800 like the 15 and the 17" had.
It also had a washed out screen with limited brightness.
It also offered a smaller HDD than the 15" and 17".
All of this describes the iBook G4.
What it HAD in common with the 15" and 17" was the obvious, an aluminum shell.
The new Unibody Macbook is not only the perfect successor to the 12" Powerbook, it certainly outshines it and is much closer inline with the pro models.
Point well taken. There was a lot of complaints about the 12" Powerbook being a steep price increase to the somewhat comparable iBook.
Your characterization the Powerbook G4 12", however, tends to negate some of its features which separated it from the iBook. The 12" Powerbook has consistently featured a faster process than the iBook. Even when the processor was less than the 17" model, it tended to be equivalent to the
base 15" model. Its graphics card also was superior to the iBook. Same with the
hard drive, it tended to be equal with the base 15" model. Granted, it did not have a PC card slot or a the same graphics card as the larger models, but there were certain form factors to be considered. It would be tough (if not impossible) to integrate the same features into much smaller area without it running too hot.
And sure the max RAM on the Powerbook 12" was the same with the iBook, but I don't feel that maximum RAM capacity is an indicator of a Pro/consumer performance. The Powerbook RAM used faster RAM (PC 2700) than the iBook (PC 2100) (with the exception of the latest model iBook which ran at the same PC 2700 speeds). I mean, both the Macbook and the Macbook Pro hold the same amount of RAM, but that's not to say that the MBP is a supped-up MB.
That being said, we can technically consider every Powerbook/MPB a glorified iBook/Mb. The only differences are: (feature 1), (feature 2), (feature 3) that is present on the Pro machines but absent on the consumer models.
I think the Powerbook 12" had enough differences to take it out of the iBook category. I think you offer a fair assessment, but I take a alternative view on the differences.