Not that anyone's even bothered knocking off their current generation products. The majority of Arduino clones are still using AVR or occasionally SAMD processo

Not that anyone's even bothered knocking off their current generation products. The majority of Arduino clones are still using AVR or occasionally SAMD processors - Arduino's newer boards were never really accepted by the community. Some makers have even gone another direction entirely - ESP32-based development boards are popular, and there's a compatibility layer for using the Arduino IDE with those.