EddieDean said:
I don’t think it quite counts as interesting development for Ahsoka, since she’s portrayed as merely competent here (which we already know), and her plot with Lux actually doesn’t go beyond a little jealousy, which is a shame after some of the earlier setup.

You’re doing great work here, man!

I do feel like I need to stand up for this arc, though. On my recent rewatch, I came to realize how important this arc was for Ahsoka’s development. First, it provides catharsis regarding the Ahsoka-Lux relationship for the audience, which is important; seeds shouldn’t be planted if they don’t go anywhere (which we sadly learned with the ST). I know the arc doesn’t do a great job coming through on it in the writing, but at least it addresses the relationship’s culmination/end. Second, while admittedly very subtle, there are two things Ahsoka struggles with here: her jealousy, obviously, meaning that she wants to hold onto Lux – a moment where she’s tempted to be possessive (a very Dark Side emotion)…but even more than that, she realizes that she needs to let go of her attachment to Lux (on a romantic level) AND her attachments in general (on a spiritual/Jedi level). This realization is then immediately challenged when she can’t save the girl Lux loves at the end, making her question her role as a Jedi and feel kind of powerless. It’s setting her up for more internal conflict that we see pay off with Barris in her trial arc.

I may not be adequately articulating what I’m trying to say here, but I hope you get the gist. I think it’s at least worth discussing.