JT Rey is completely viable without that zeta (as someone who fights her regularly). However, most ways to counter her come from debuffs (buff immunity, shock, daze, stun), so having that zeta helps keeping her alive longer. It's also pretty essential in mirror matches.
If you're going all in on Resistance then yes. If you're using her just for her meta period then probably not.
Although everyone always said that CLS other zetas were useless but they helped me on defense so who tf knows.
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Although everyone always said that CLS other zetas were useless but they helped me on defense so who tf knows.