There is no purpose to delineating government revenues since money is fungible.

Even though legislators might label or apportion some source of tax to some specific expense, in reality, they can always move it elsewhere (since they are the legislators). Therefore, it is always a question of which expense has political priority.

I thought the problem with CA was that the state budget isn't fungible - 90%+ of the money is allocated via ballot measures or the state constitution and can't be touched by the legislature.

I do not know enough about CA budget's mechanics, but that would seem like a very inefficient and ineffective way to operate a state.

https://www.budgetchallenge.org/pages/home gets you an idea of the challenge that they have.