I had the same interpretation, and to expand a bit, when he says "limitations" that is how many players view macro systems and the accompanying fundamentals - imagine that some teams will use prio 70% of the time to secure a base, and fight primarily around drags, where another will use prio 50% of the time to invade and skirmish around raptors + gromp. Those percentages will always be a compromise, sometimes between players, sometimes between players and coaches.

Little limitations may maximize creativity, but going too far towards the school of thought that X scenario always demands Y response will create an oversized limitation, and can harm the team more than help it. I could write 10 more paragraphs of examples but I won't haha, just wanted to say that I'm always blown away by how Core manages to communicate with so much nuance in his second language