Yah, if Ammy didn't intervene to set Emma straight before, she wasn't gonna now.
But I agree in that Emma's character arc, compared to pretty much anyone else Taylor has interacted with, feels more.....'unfinished'.
But at the same time, I'm not sure how Emma 'grows' while staying in Taylor's orbit (even if it's tangentially via Yuuta) yet stays away from Taylor entirely - but the scene seems to indicate at least SOME level of finality/closure/break.....so.....who knows.
I feel of two minds - as you say, the sendoff was good, for its being an intentional messy, bitter-sweet affair. Taylor still lacks context (either through unintentional ignorance, longstanding mistrust, or a little of both) and Emma's not emotionally mature enough to say what she needs to really say (and/or doesn't know what she believes yet).
But it definitely feels like a much earlier/more incomplete 'sendoff' than any of the other characters in Taylor's orbit who have also largely fallen into a more distant orbit, such as Kayden, who serves as quite the stark contrast.
All in all, while I respect the scene, I also hope it's not the 'end' of Emma's growth/involvement, even if it happens largely, or entirely, away from Taylor.