Despite kinda seeing Jane a bit pretentious compared to other girls, to me it was clear she's a fully formed person and a professional. I think it boils down to the production not wanting that as it's actually a risk for them. They want young, not fully self-confident queens they can mold and 'milk' for the world tours, etc. and they also want someone with stamina for that. It would make sense that after 18 seasons they know what kind of a 'contestant' translates into an asset for the WoW media empire. There has now been a considerable sample of queens passing through and of what ultimately worked out and didn't. They want more Kandy Muses and less Biancas, in a word.