Having attended many of these festivals, there isn't much to argue with here. The biggest thing to note is, as you said, for Saturday at Magnaball to be seriously considered as one of the single greatest shows in Phish history is truly an achievement for a band in their 33rd year.

Whereas other bands coast on their one hit or simply tour every year with a "greatest hits" setlist (looking at you Tom Petty) Phish is out there every night improvising, trying new music and generally saying "what can we do next?"