when it comes to comparing eras and the shots produced, a legitimate argument is that the racket technology has improved.
I feel like this argument might not hold up for volley skills though. Is it much harder to hit a volley with an old racket?
And more importantly, since the shots were an awful less fast and heavy back in the days, are the volley skills of players like McEnroe that impressive? I mean surely the degree of anticipation needed was far less important. From the couple matches I've seen from that era the volleys don't seem that impressive and McEnroe missed some pretty damn easy ones.
This leads me to think that Federer might be much higher in the list of the GOATS of volleys, maybe third behind Edberg and Sampras in my opinion.