Only my opinion but I don't think they wanted the mask mandate. There was talk of them dropping it a couple weeks out, but there was a huge uproar over it. Based on what happened there it ended up being the majority that did not want them, and only a small minority who did. It should be the attendees choice if there are no local, state or federal mandates.
Gencon wont have that same issue if they choose to keep the mask mandate because they will enforce it, like last year. Most attendees will play by the rules if they know they will be enforced.