The ONLY content you are currently "locked out of" aka can't beat if you don't work for it, are the two ultimate fights because you can't unsync them. Can't beat savage this tier/expansion? Wait, get better gear, level up etc and beat it then. What you want is access to the best gear without working for it.
Also if they ever were to listen to this, i can guarantee you a lot of players will unsub because the fights lose meaning. Why work hard and improve to get something when everyone can get it for tickeling the boss until it dies an hour later. What's next? "Don't let players die for failing a mechanic so they have a chance of doing the content"?