I do admit that I often see villains like Zenos to be uninteresting and shallow. I do recognize that this type of villain is needed and if they are well-written. However I just can't see myself liking or finding Zenos interesting/compelling, even if the writing is as good as ShB. I just feel like it's not possible to make him interesting without retconing/changing his character from his SB self.

Thw only thing related to Zenos I'm looking forward too, is only why he dreamed the final days and what has emet done to him. I don't care about Zenos himself nor his duel with us. I would be happy if turns out he's the level 83 or 89 trial and not the final boss (very unlikely though).

I'm not even sure myself why I hate him that much. Maybe because he's the combination of all those villain tropes, such as:
1. Villains who only care about battle (battle freak)
2. Emotionless
3. Being super creepy and obsessed with the MC