Well, first we have to agree that in general Federer-Djokovic produce better matches than Federer-Nadal, it could be the high tempo of the rallies, Djokovic supreme returning it is just more pleasing to the eye. Nadal plays a more predictable game and probably this alter my interpretation of quality.
Those finals were no different to other matches in their rivalry. At the time i didn't like that 2008 ended in the dark but it was the same for both and if anything gave an advantage to Federer and his serving, but still quality in the 5th wasn't stellar. 2019 was up and down (due to Djokovic fluctuations) but there were patches where both seemed like they could not miss, despite the high groundrokes speed. The 5th set was crazy...
....
How do you want to argue any legit talking point if that is your preface?
The 08 rallies were faster than in 19, dude.
The fifth set wasnt crazy. Federer and Djokovic each had one horrendous self-break, and 2 more bad losses of service. There were crazy moments, but it never managed to create any spectacular points on big points. It was just error error error...
Djokovic didn't even play a great first set tiebreak, Federer just couldnt take advantage of Djokovic's passiveness.
When you are legitimately trying to compare a performance in which one player was being more so a wall and having a pretty weak forehand for the whole match vs another who tried attacking but choked repeatedly to a match considered the greatest ever, you went off the deep end. That 08 final has classic shotmaking, rallies, clutcher moments, more consistent level of play...
Thats all I'll say on this. Would be a waste of time to argue against something no one believes in anyway.