I disagree.Because of doing content unsynced a lot of people actually dont know recycled mechanics.I see it the whole time.
Nidhogg ex is a prime example of people not bothering to learn mechanics.There is actually a much lower success rate of players clearing this at lvl 70 than there was at lvl 60.
Simple reason is people are being brought up on the idea that its more important to dps hard to skip mechanics than to learn mechanics.
The end result being that people run around like headlless chickens on fireball phase and kill each other and then blame low dps.