Perhaps NIN were going to announce their tour at the same time as Primavera and then chose to delay or cancel it, then they scrambled and got Central Cee as a replacement, then the band changed their mind and gave the festival the option to book them again.
food and pissing everywhere ... its great to have that choice ... you can still go basic if you want but get the chance to try things beyond the usual ... for me not so much as the carbs and my sugar levels are a ballache to control .
A couple of years back there was a move to replace Green Traffic volunteers with professional staff. Fortunately someone high up intervened and basically said “leave them, they know the job and do a great job”