Finally, my Nucleo board is supported by the Arduino project (see here the core). The first effect is that the board enters in the RAD (Rapid Application Development) category of the selected Arduino compatible boards. It means also that I can test directly the TSL2591 Lux sensor (my DIY SLR film camera needs it) using the Adafruit library. We will see how this goes in the near future.
I’m definitely not a fan of the wiring language but I can’t ignore the deep pool of resources (a large variety of libraries and projects) accumulated over the years within the Arduino ecosystem. This being said, I will continue my adventure in learning the much more efficient Low Level libraries of STM32 microcontrollers, combining the two worlds as much as possible.