No. The law provides that residents of California, as well as residents of other states, can hold property titled in many different forms. The law also allows spouses to transfer property between themselves, so long as they follow certain well-defined procedures and methods.
Holding property titled one way as opposed to another has certain advantages when it comes to asset protection. Agreements that help protect your assets from creditor claims simply take advantage of the legal rights available to individuals to hold title to property as they choose.