It’s all part of a bigger plan to integrate the MCU sleep modes and network coprocessor (u-blox for the Boron, ESP32 for the Argon) sleep modes.
Once complete, the possibilities are really great for very low power operation. The SARA-R410M has great low-power modes as does the nRF52840, plus the nRF52 can go into sleep mode and wake up when the modem sends data across its serial connection.
Exciting stuff! Just not ready yet.