Most Arduinos are just fancy ATmega breakout boards, and ATmegas are used in some production electronics. You can most certainly prototype consumer electronics with Arduinos and then design production hardware after you've proven the concept.
The Arduino IDE is also compatible with various other microcontrollers, including the STM32 family which are extremely widely used in production electronics. Typically their production code isn't written with the Arduino tools but you can most certainly prototype with it.
The Arduino IDE is also compatible with various other microcontrollers, including the STM32 family which are extremely widely used in production electronics. Typically their production code isn't written with the Arduino tools but you can most certainly prototype with it.