True, I always wondered why it was decided to cut the alps in 2 halves.
One messy half and one organised half ?
As for the Rockies, Ands, Himalayas I think this is partly due to the fact if we stick to the SP rules (for an area, it is not necessary to have climbed all peaks but to have a good knowledge), no one can do that. There will be a page about such ranges when people will start a common project. Perhaps people are scared about the potential size of such pages but I'm not sure they should, sub-pages are there to contain details. I don't know about you but I would be pleased to read an SP-made (and not some vague generalities) overview about the Ands or the Rockies. Given the amount of members in US, the rockies are widely within reach of hand.