The CC13xx/CC26xx MCUs from Texas Instruments combine an ARM Cortex M3 microprocessor with a Sub-1GHz and/or a 2.4Ghz Bluetooth/IEEE 802.15.4 Transceiver.
We use them quite successfully in our products. The MCU is exceptionally low power and the transceiver has long range modes comparable to LoRa and high performance modes for shorter distances.
Their weakest point in our opinion however is the Code Composer Studio IDE which is based on Eclipse. At the moment this is the only way to develop for these MCUs we know of.
Having another option would be quite helpful. It would also enable us to unify our embedded development, because we are also working with SAMD21 and ESP32 MCUs which are already supported.