I think the main worry is lack of headroom for Reeves to remain in within her fiscal rules, so unless she's going to break them it could mean spending cuts to tax rises...something like that.
Reading a few people saying that BoE should maybe ease up on the 2% inflation target with all the global stuff going on, maybe have to live with inflation a bit higher and start cutting rates to help the economy a bit...something like that again.
This is true but in fairness to the bookers it does seem to be pretty unpredictable at times. Megan thee Stallion had a decent sized crowd up against Paul McCartney, whereas the following year Wizkid was completely dead up against Arctic Monkeys. I guess it's not just about Pyramid vs Other, but everything else that's going on that might pull people away (that would be out of the main stage bookers control).