The board support package for the STM32WB Feather Development Board (see https://www.reclaimerlabs.com/stm32wb-feather) is restricted to the JP1 and JP3 pin header, the onboard LEDs and switches (buttons), and the onboard 16 MiB serial NOR flash. The STM32WB55 has much more capabilities than 11 digital I/O pins, 6 analog input pins, UART, SPI, and I2C interfaces. But if you want to use the more advanced features you can use the CubeMX to create source code for the internal peripherals. This project wants to show how to use the Cube Ecosystem for a Forth system (or vice versa) and can't implement all features and possibilities the STM32WB has. It is a good starting point for your project.