That long articles are necessary to rank in Google is a myth.
https://twitter.com/mnlfrgr/status/1074653395997388800
I wonder if it only applies to new blogs though? Perhaps if you have good DA/PA/TTF metrics already then it doesn't actually matter about your content length.
I am genuinely interested in the answer to this though. The idea that the article has to be longer/more detailed than the competition makes total sense.