Elemental Wheel, What's the point?

[Alhanelem]

If someone wants to play this game as BLM only and that content locks them out cause the mobs are weak to everything it does is bad game balance.

No, it's not bad balance. If everyone performs the same against all mobs there's no point in having different classes, in which case you could just remove all jobs from the game except one.

If a mob is strong against certain elements and it creates a problem for you, you either switch jobs, team up with someone who compliments your job's strengths and weaknesses or find something else to fight. This isn't just a solo game, and not everything is meant to be beatable equallly by all classes. They shouldnt dumb down the game just because someone refuses to play more than one class.

Beyond all that, eliminating elements basically eliminates black mage's existence. Black mages use elemental magic. That's what they do. Instead of Fire, thunder, and blizzard, we'd have "Damage Spell."

The pokemon example is great. Without the type dynamic, variety in moves would be drastically reduced and battle would be a lot more boring as it would eliminate most of the means of gaining a combat advantage.