Apple has definitely softened up Siri’s demeanor over the years, and I think it was a deliberate decision to introduce her as standoffish.

I once read that waitresses who initially come off as rude earn higher tips, but only if their mood softens throughout the meal. There seems to be something about “winning” the waitstaff over that makes diners reward them with higher tips.

IMO, it was a feature to have Siri come off as rude when her abilities and comprehension were still in development.