Those MagicBand functions are only at WDW not at
Disneyland. My guess is because Disneyland is a locals' park, most local people do not want one more thing to bring to the park, especially one they have to spend money on when there is already something in their pocket that can accomplish most of the same functions.
If I already had a recent MagicBand from a WDW trip, I would bring it to Disneyland. I'm not sure I would spend the money for a MagicBand for a single Disneyland trip. I would consider it if I knew there would be another Disney trip (Disneyland, WDW, or
Disney Cruise) soon.