A lvl 80 boost gives you i believe Celestial gear which is kind of an all arounder and even meta on some professions, so you can continue with open world content as you like. And if your trait combination doesn't work, make another, you can "respec" any time out of combat, just swap traits in the hero panel.
If you boost to 80, grab your espec, and proceed to do all the 1-80 story you’ll have plenty of time fighting easy enemies to learn what your skills do. If you also map complete (all hearts/poi/hero challenges/waypoints) core you’ll have way more than enough time. That’s a pretty big task.
It is before level 80(More specifically before level 45) is when choosing which utility skills and traits becomes important. Also, anyone who's worrying about min-maxing on their first character at level 11, is playing the wrong game. At level 1-45 is the best time to min-max. After that, OP can choose liberally on how he spend his hero points.
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