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Those are two different genres. Most shounen series still have simpler titles. Jujutsu Kaisen, Demon Slayer, Black Clover, Chainsaw Man, My Hero Academia, Promised Neverland, etc. Ones with long titles tend to be comedy, shoujo, or ecchi.
The long ones (that basically spoil the plot in the title itself) are mostly isekai, made to distinguish themselves from each other in the oversaturated isekai light novel/manga market. Probably 90% of all long anime titles are from the isekai genre alone.
I considered that at first but there are a lot of long title series that don't fall under the isekai umbrella, while the isekais that fall under the shounen umbrella tend to still have the shorter titles.
It just so happens that most isekai fall under the shoujo/ecchi/comedy umbrella, hence the large amount of overlap. So while there's definitely an association, I wouldn't necessarily consider it an isekai thing specifically.
afaik a lot of recent mangas & anime started out as web novels.
the popular sites at the time didnt have subtitles or descriptions, so authors worked arround that by putting a description in the title field.
as far as i have heard those sites now have subtitles and descriptions,
so this should be a temporary trend