I'm giving my opinion, rather than overthinking it.
Whilst I agree with the majority of your comments, I'm fully aware of the party and singalong generated by the Legend Slot having attended stacks of them.
A better voice certainly contributes to it being a greater experience in my view - Lionel was phenomenal and was still a TOP performer at the time. As was Kylie. Diana Ross had a world class band to accompany some of the greatest Mowtown tracks of all time (so her waining voice was very much supported by that). I was pretty gutted by Shania. I was a massive fan of hers growing up. The performance pales in comparison to other Legend slots.
I've nothing against Rod. He has some cracking tracks and I know people will have a great time. I'm personally disappointed as I think it could have been a much better performer, but as I said, I can just explore!
The guys over on the Glasto discord have it under good authority that Paramore will be playing, they’re currently using an extended traffic light system to determine how likely someone is ranging from ❌🔴🟠🟡🟢🔵✅ and Paramore are currently marked with a 🔵
I’m not sure what the original post said or where the source came from but they’re confident they’ll be at the festival in some capacity
If you base you FOMO around the announcement of one artist then I'd suggest Glasto probably isn't the place to be anyway.
I could pretty much see no major artist and have the 5 best days of my year.
I wont be at Rod, Lots will be but ill be elsewhere, having a great time I'm sure.