Perhaps you miss the part where the Yukiko said,Having an element wheel creates class segregation when it comes to progression. Without redoing the current mechanic entirely, how do you expect a BLM to dps if the mob is completely immune to ice or fire?
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"And just to remind you: element wheel is only "one" example of how it can be done, there are many other possibilities!"Jobs should not be exploiting weakness or what not.
Jobs should be "pick up and play" WoW-type classes. No preparation required but you have to dodge.
Classes could be the preparation heavy alternative for people with crap ping. Where combat leans more towards old school FF with less dependency on reaction time (and hence latency).