I can see why it would be for a Djoker fan. But as a Fed fan it was huge. At 38, winning this match is a big deal if you are a Fed fan after what we have been through this year. Plus, it gives him an opportunity to win the tourney now too.Djokovic would have needed to win two more tough matches over Tsitsipas and Thiem/Zverev to be #1. Plus Djokovic already has 275 weeks and 5 years at #1, he's not desperate to be #1.
Overrated match just because of Federer. In 2016 the #1 was really on the line between Murray and Djokovic but I never heard of it as a great win for Murray.
If I were a Djoker fan, I would not be too bummed, as he will have plenty of opportunities in the future to get weeks or WTF's and maybe YE#1's. But Fed fans know the end could be right around the corner, so naturally we hang on to wins and losses more than other fan bases.
This time will come for Djoker fans too eventually.