We used to. CA originally had two chambers, one with representation by county and one by population, just like the United States. Then the Supremes ruled that representation by political subdivision was not allowed and both houses are now only by population.
As a guy who escaped CA to southern Oregon the only thing I don't like about a state of Jefferson is that the CA part is used to a ~10% sales tax and we will probably get that. In OR the sales tax is 0.
Your sales tax in Oregon is Zero but your state income tax is high and you are broke as well with well over 95% of your state budget going to entitlements. No matter how you cut it, unless the rural areas have “better” representation, the highly populated cities will control the politics.