I agree, but it all depends on each owners needs.
If that extra 1GB of RAM, or that new video card, would make a significant difference to an existing MBP owner then new definitely does matter.
For the vast majority, though, the previous model of MBP will remain a powerful and useful tool long into the future.
I've heard a lot of people talking about obsolete technology here during the last few days. Floppy drives are obsolete. CRT monitors are obsolete. Computers often quickly become outdated, but it takes many years for a system to become so outdated that it is no longer useful to its owner - and only then can it really be classed as obsolete.