Maybe it's something they only add in luxury homes.
(Note: I'm a New Yorker but not an expert in building code.)
I would believe it's different in CA, though. CA's public health regulations are famously stricter than elsewhere in the country.
Thinking back so did my home in VA, DC and my last two homes in TX. I wonder what is different about our scenarios
On top of that I’m not sure if anyone has studied what percentage of people actually turn their fume hoods on, because I bet that is low too.
A true fume hood overhangs the front of the stove and can be heard when turned on, and requires makeup air.
https://www.youtube.com/watch?v=rSIqKGsF2ZA
(Note that a proper ventilation system is recommended for ANY stove/cooking besides maybe a microwave/pressure cooker, but especially needed for gas)