Why is ‘Cornell 5/8/77’ thought to be the greatest Grateful Dead concert?

 https://faroutmagazine.co.uk/why-5-8-77-greatest-grateful-dead-concert/

https://www.youtube.com/watch?v=IC4QWv3doDE&list=PLzptvlG1JiNBhiWTS4PZF8u4Uf35nMOno