That's okay! You can still have a second kitchen within a home or extra living space, it just won't get a separate address or be considered an official ADU. This is one of the extra benefits of the new ADU ordinance; there's more flexibility in how you can design your home and living space. Previously, additional living spaces could not have second kitchens. This option may be a good approach for some people and could avoid complications with utility districts.
For example, if it’s not possible to convert a basement to an ADU because of applicable building codes, then it’s still possible to have a bedroom, bathroom, kitchen in the basement for family members or roommates. The space would just be treated as additional square footage for the primary home.