We are currently working in a home automation start-up and is using Wi-Fi for communication. It would be highly beneficial if you could provide the details of 2.4 GHz transceivers and WiFi SoCs, having a minimum of 30 GPIOs.
Also, about the microcontroller that support the features of MATTER.
The 2.4Ghz transceiver(Bluetooth/WiFi/Combo of both) radios can be used with a host processor of your choice. We have support drivers for RTOS-based systems as well as Linux-based systems(Android and Linux OS). An example would be to use CYW4343W with our PSoC6 MCU over the SDIO interface and RTOS drivers.