The Djokodal era was 2011-2013 which was indeed stronger. But it was stronger than some of Djokodal's years too, like 2010 and 2017 for Nadal and 2014-2016 for Djokovic.I'll give you my general answer on this. I think despite Federer's competition being inconsistent compared with Djokodal's, the inconsistent player's did peak at times and give Fed a run for his money in a way that no mug from Djokodal's time could rarely ever do, most players would just mentally fold after a period of time. The overall inconsistency of those individual players could also be attributed to the opinion that the competition was a high-quality back and forth struggle to be the second or third best at that time. Overall though, I find this kind of competition not as strong as the very consistent top players in Djokodal's era. Federer fans get triggered when you use the word "weaker" even though I do believe it was, so I prefer to just say instead, that Djokodal's era was stronger.
So again, Federer doesn't have to be singled out.