I also noticed the energy saver option is gone totally.
MCU2 doesn't have have it, or should I say it doesn't not have it, i.e. it doesn't have a low power standby mode that the MCU1 does, so the only choice is to shut it down completely when not in use and boot it back up when needed. I don't know if it's because Intel chip they chose doesn't have such a sleep mode (obviously Intel based laptops do have sleep mode, so it exists in at least some Intel chips), or because Tesla just chose not to implement the software for it, or because the Intel sleep mode was too power hungry anyways.
Another way to put it, MCU2 has energy saving mode, but no way to disable it, hence no more setting.