There's something of an underlying of theme of wish fulfillment w/ how Zeniths work, so nearly all of them on some level are into their transformations, but the transformations also act off of subconscious desires so at least initially there are those who are resistant/irritated by the changes. For instance Chun Hae, as shown in her story, is displeased/worried about the changes at first, but eventually learns to deal with it because it turns out she's REALLY into pushing her body to the limit.

Most irritations come after fully indulging their desires and they have to try and attempt to do normal human stuff, ie Lyssa expanding to ridiculous proportions and then realizing she needs to go buy groceries while still sporting a near-immobilizing ass.