Yeah, I ended up enjoying the beginning of Shadowlands more than I thought I would, but none of the selling points interested me at all. As I pointed out even back then, the most exciting thing to me was the new customization system, which was never even listed in the official expansion features for some reason (they listed other things that were added for all players like the overhauled leveling, not just expansion-only features). I mean, customization doesn't carry the actual expansion itself, but I went from having one or two pseudo-alts to six or seven full alts between new options that made me way more excited for them and the streamlined leveling that allowed me to skip the things I dreaded.
It actually feels a little surreal when I think about the fact that Shadowlands is when that was added. It feels like a million years ago, although that's probably in part because they have barely touched any customization since.
I'd love to expect tons more options and the rest of the heritage armor and such in the next expansion, but without knowing why Shadowlands basically dropped those things I don't feel optimistic.