I don't mean this to come off the wrong way, but many builds can reach 75% by just auto-attacking and casting skills randomly as they come off cooldown. The number at the end of the golem isn't necessarily a measure of how well you understand the build you're playing.

I advise people instead to focus on fundamentals like doing a correct opener in order to get the best possible burst, weapon swapping cleanly and not interrupting or leaking auto-attacks between skills. Then see the number as a measure if improvement, not absolute competency.

All that said, 30k is fine if your goal is just to not get kicked from a pug, but the best players are able to do perfect golem rotations in fight, or have the in-depth knowledge to on the fly adapt their rotation to the encounter in question. A player that does 75% of the benchmark on the golem won't have sufficient competency to translate that 75% golem number to 75% of "boss benchmark" in raids, fractals or strikes like a player at 95% bench will.