Many don't get this part.. the bolded partFed failed, big deal. It's his own fault.
But I also admit that Fed had it much harder post 28 than Novak. It is not even up for debate. Unless you think facing younger Djokodal is the same as facing Thiem, Zverev, Medvedev and Tsitsipas.
And yes, Fed had it easier in 2004-2007, but the man was 23-26 then, he would have done great anyway. Novak, OTOH, wouldn't have 19 slams if he had great competition post 27.