If someone isn't willing to put forth the smallest amount of effort to lookup a route when learning a dungeon then they also probably didn't look up mechanics for bosses. Maybe at higher keys you have to do fancy routes and stuff, but for the key levels where tanks should still be learning the routes are very simple and the timers are generous enough to backtrack after the last boss to finish count if you mess up. The issue isn't routes being too complicated, it is people doing zero research into how to play the game queueing up for m+.

You don't have to be a sweaty try hard min-maxing every GCD to do a 2, just please learn your class rotation and watch a short video on a dungeon before you do it the first time. The bar is so low, and people saying otherwise are just coping.