Distance between Glastonbury stages is a huge Thing. Inaccurate to pretend it's not. I run marathons and I found it tough. Can take 20 - 30 mins to switch between a lot of the main stages. In saying this, getting around the stages at Primavera 2022 was nowhere near as simple as in the past!
Also is worth remembering, as has been mentioned, that last year acts like Thy Art Is Murder, Polyphia, Babymetal and Bowling For Soup were logo acts on the initial lineup poster but ended up not being on the final lineup. It’s an ego/management thing.