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aFFi That's because all three of the major otome game isekai manga are subverting the trappings of the genre in some way.
Yeah, otome games are vapid drivel. That's what Duke's Daughter is making fun of.
Bakarina goes a step further by making fun of the main characters of otome game isekai manga since Bakarina's struggles are all for naught in a fascinating way.
And then Observation Log makes fun of those characters by showcasing them from the perspective of a straight man in the form of Prince Cecil.
They all do something at least slightly innovative unlike most isekai out there.