My 2c: I got into electronics, firmware, and PCB design during the Pandemic, and haven't used Arduino beyond cursory support for integrations. At the time, it used obsolete chips, and didn't have a practical advantage over STM32, Nordic, Espressif chips (Or dev boards) beyond name recognition. I speculate that there was a time before this when it had innovative UX for new users segment, but this hasn't been true for (at least, from my experience) 6 years.