Leveling multiple classes during MSQ?

[Brightamethyst]

Please don’t reply with “Play it your way”, my way of playing is efficiently, I find efficiency fun and interesting. Playing without a plan in place makes me nervous and takes away the fun.

The reason people always say “play it your way” is because it's true.

There are no hard and fast rules when it comes to leveling. If you want to be as efficient as possible and maximize every bit of exp, go for it. Just because someone else prefers to take it easy on a single job doesn't mean you have to as well.