TBC and vanilla fights were gear checks through and through minimal mechanics, where now its a brain check can you deal with these mechanics if yes then the encounter will be fairly easy if no your raid will highly likely just get completely rekt there still is the odd gear check boss every now n then in new raids however they still tend to have some mechanics to deal with more than the average vanilla boss does at the very least, the game is alot harder for a dps then its even been.