I’ve done 2 rounds, I’d have been happy enough doing either on a hardtail in riding terms, I’ve ridden all the stages and raced most on my ragley ti (I’ve ridden most of the stages on my fatbike!). But I used the full suss for ews, just because it’s not something you get to do often so why piss about? I like racing on hardtails (I’ve done one enduro on the fatbike because I’m an attention whore) but EWS is a bit special, as a weekend warrior
(I suppose there’s a middle ground here where a hardtail brand might want to stick a good-but-not-winning rider in just for the visibility.)
Also, you can’t mess with other people’s day, it’s one thing slowing yourself down but it’s likely to mean you get passed more. That’s managable- I’ve done it in the SES and ukge- but it’s a consideration