That's only true in extremis: it's not even completely true of car/industrial motors! Companies like Cummins design motors that are used in all sorts of applica

That's only true in extremis: it's not even completely true of car/industrial motors! Companies like Cummins design motors that are used in all sorts of applications, e.g. https://www.cummins.com/engines/qst30 https://www.cummins.com/engines/qst30 When you look at smaller motors (e.g. DC motors in handheld consumer products), they're basically jellybean parts targeted towards the highly specific use case of making a shaft turn.