No, I haven’t seen She-Ra. I’ve heard it’s good though!
I get what you’re saying about their relationship, but tbh I think Rey and Ben’s relationship is the most interesting aspect of the trilogy (at least the most compelling character dynamic). I mean I think the way it ignited fan fiction, fan videos and other creations showed how it inspired and captivated many fans.
I think a lot of the problem boils down to the fact I think they made Kylo too “evil” for evil’s sake. Kylo’s reasons for turning to the dark side are vague, and that makes his crimes harder to excuse or justify for a lot of people.
If Kylo’s motivations had been made clearer, and if you could see the reason why he did “bad” things, I think more people would’ve been open to Reylo.
I think ATLA does a good job of handling Zuko’s motivations and actions. So much so, that I think Zutara probably would have worked if they had went for it.