I don’t look at Zoey looks in this situation, although looks can emphasize personality. My first impression of her was that she was a rebel going against the system. Also, it’s worth considering that Zoey/MC were not a couple in the usual sense, they were more like friends with benefits. This is how their relationship worked and how Zoey looked at this before leaving, even though MC was in love with her. For MC she was the only partner, but we don’t know about Zoey.
I got the impression about her that she is not against casual sex, it would correspond to her rebellious personality. She doesn't have to be like Sarah/Melanie to do this. Girl can have a pleasant personality, but at the same time be for casual things. And even Sarah and Melanie are completely different if you look closely at them. Sarah is a rather cold-blooded, cynical and calculating person. Melanie has a much warmer personality.
I won't say that Zoey should have fucked everything that moved in SD, but one or two hot scenes could have made Interlude more intense. For example, the same Emma/Zoey/Orange guy threesome. Interlude was received coldly and controversially, but everyone loves lewds and this could cover up some of the negativity.
But, to each his own. In any case, I really like her as a person and it will be interesting to watch the development of MC/Zoey. Especially when they are both DIK affinity.