Sure, but still a huge sunk cost to have designed and fabbed a bunch of the previous ones.

And? Technology changes over time - not just with Mac's.

Regular server racks have not, though. 1U has been 1U for a very long time... Didn't matter if it was an IBM server, Dell, HP, or custom built. This is why we have standards.

These poor saps bet BIG on a non-standard, and seem to have discovered why we like standards after all.