Season 1 made a HUGE profit for Netflix, also season 2 won't flop(Grand Line hype + Alabasta). At the least they could film seasons 2 and 3 at once for experiment.
Oda actively pushes against a lot of the more nonsensical stuff they want which im sure also makes them hesitant like romance amongst the crew
It could fail if its getting in the way of the manga and the fans abandon it.
 
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