I do not believe you have run a modern module if you don't think they let players go wild with solutions. They might include a solution instead of leaving it as an exercise for the DM, but they very much let players approach them however they want.
Anyway, putting random monsters in a room and telling the DM to figure something out is inherently flawed. It's literally incomplete, and has filler encounters. Those are definitely flaws in a prepared adventure. As I've repeatedly said, they wouldn't be flaws in a different type of publication, but we're not discussing that type of publication.
Also, you forgot to defend your actual point. Even if they weren't flaws, how would that make people who don't like that "style" cowards?