BLs and Yaois have interesting plots, character development, and writing. Not just constant misunderstandings, miscommunication, and the protag having the emotional intelligence of a fucking rock.
(This is all entirely my opinion, and I by no means am hating or bashing the writers' or mangakas' works, I just wish there were more stories that focused on development and dynamics, and not just getting the two characters together when they are drier than goddamn triscuit cracker.)