It's not much fun being forced to level additional jobs, you don't want to play, just to be a "complete" character. I don't want to be a BLM and having to take BLM up to get Swiftcast is a royal pain in the tuckus. I say the same for crafting; I want to weave, not hammer, and having to level CRP, CUL, and BSM to be a good Weaver, is also a pain. I've done it to do it, but I loathe those parts of "role completion". I'd trade this, for a linear single-role skill tree without looking back.