Agreed, but things move at a very quick pace. 5 years ago, none of us had much of a clue about Billie Elilsh, or Dave, or Sam Fender, and Dua Lipa was playing the tent. Things move quickly. In 5 years Olivia Rodrigo may have missed the boat and we are talking about the next new upstart.
Bands like Foo Fighters / Coldplay / Arctics will always be in the mix but who joins them will always be fluid. I think Billie / Macca / Kendrick was one of the best mixes of headliners they've ever done. In 2017 that would have sounded pretty feeble...