SE's m.o. is to ignore everything that is implemented poorly and move on to new stuff.

They had classes, but the new jobs didn't have them. They tried a double job class, but it didn't work like they wanted so they left it alone and didn't introduce more. They had cross class skills, but when rogue and ninja came they didn't introduce any new. HW didn't even bring new traits, I'm not surpried if we'll never see any new cross class skills again.