You dont hit the interstate on your bike you cant just take the existing commute and do it on a bike most places. Also Southern CA isnt the country or even very representative.
Why did you think virtually nobody commutes via bike?
The comment I was replying to explicitly used socal as their example of unbikable. That's why I am talking about it. Many socal commutes are unbikable, but not the "vast majority" and even fewer when you extend to other car free options. I biked to work this morning in LA (4 miles of surface streets).
Why did you think virtually nobody commutes via bike?