No, they ask for 540+ because they want to be carried.This is why people ask for 540+ ilvls for flex mode because they know that people are unwilling to be smart and learn the fights before they go in.
Gear does not fix stupid. Regardless of how high your item level is, a dead player still does 0 dps.
Of course seeing the fight first-hand is essential for learning it properly. That's no excuse for not reading a strat.Even looking it up. It feels WAY different then a guide telling me what to do. Time and time again this has proven true. Doing it myself has been more of a learning experience for me then looking it up. If that's bad to some people, I won't lose any sleep over it.