I thought they swiped them from Maple Story's cutting room floor myself.
Probably rounded up a bunch of Korean MMOs and liberally stole from all of them.
But yeah, a 3DS backlash would've been more akin to when games like DQIX and SMTIV got announced for it, people who snub handhelds or want the highest fidelity would be disappointed, but they could probably still put a traditional experience out and many would be happy. Heck, the same could've happened here WITH PC as a fallback in which case it would be closer to DQIX or SMTIV here, but instead it sounds like it's some MMO-ish thing, and combining that with being mobile, the series being dormant for a decade, and being a NUMBERED installment is just one of the biggest dick moves one can possibly make. Seriously, what the fuck's the point, may as well either make a new IP or at least relegate to a spin-off.