that one time I mocked a manga title and hit my head and died. Before I knew it, I became the greatest dragon knight
It's basically a mix of a trend mixed with a mix of requirements. The most popular Light Novels websites don't give any way of displaying a description hence Light Novels in Asian countries have their titles selected as both a title and a description. This have been numerous proofs that new authors have WAY more success on those platforms with a long descriptive title that a short one. The manga and anime simply followed the trend as adaptations had to follow.
When will these mangakas stop smoking whatever it is that helps them come up with these fking lines