What's the appeal of top Dazai x bottom Chuuya?

Hi y'all, as a long time skk/kunidazai fan, I've read quite a bit of ao3. and omg it hurts so much seeing the 36k or so fics under Dazai Osamu/Nakahara Chuuya be filtered down to 900 or so after removing the 'top dazai' and 'switch' tags.

Anyways, the whole time I've been a fan, I've never gotten the appeal of top Dazai. I honestly would like to try and understand, this isn't meant to be me having a go at you top!zai fans, this is just a very clueless ao3 user hi

anyways what are your likes about top!zai? like how do you think it goes in reference to tropes and stuff, or whether it be a question of chuuya's 'vulnerability' in terms of him with corruption, and dazai is the only one who can wake him up, idk etc. thanks :)