HOWEVER, if California also banned open carry, then it would be illegal. You can ban open carry, OR concealed carry. Not both. Which California did. They should have pointed that out and did not. By banning both, it bans the right to keep and bear arms.
A clarification:
California has may-issue concealed carry, which is at the discretion of the county sheriff. Some counties are, for all intents and purposes, shall-issue. Others, including most urban areas, are effectively no-issue (unless you have connections).
Unloaded open carry was banned outright a few years ago after some yahoos made a point of open carrying their empty firearms on public sidewalks, into Starbucks, etc. and the bliss-ninnies got scared. Loaded open carry has been banned for as long as I can remember.
Agreed that most urban and suburban California residents cannot legally exercise their right to bear arms.