I do love how clever the international standard paper formats are. I also find the shape nice to use - coming from an international perspective, the Letter paper size feels to me uncomfortably short and squat, but then I hear Americans say they like the Letter paper's ratio much better than A4 - and at the end of the day, I think a lot of it is just that - familiarity.
It's the exact same thing with a lot of the US customary units vs. metric debate - so many more of the arguments actually boil down to mistaking "I'm familiar with this so it seems better" for meaning one is objectively better. It does definitely lead to some funny assertions, like people asserting that billions of people's ease of using metric units or Celsius temperatures must be false since the units are apparently not "human scale" etc.!
It's the exact same thing with a lot of the US customary units vs. metric debate - so many more of the arguments actually boil down to mistaking "I'm familiar with this so it seems better" for meaning one is objectively better. It does definitely lead to some funny assertions, like people asserting that billions of people's ease of using metric units or Celsius temperatures must be false since the units are apparently not "human scale" etc.!