[sabjut]

How come? Ever since controllers used Bluetooth they would need to use some sort of programmable microcontroller or cpu. Both of these things need to 'boot' at some point. And yes even microcontrollers have bootloaders.

[cesarb]

A traditional videogame controller is not much more than a few switches and perhaps a few potentiometers, see for instance the pinout for the Master System: https://www.smspower.org/Development/ControllerPort

That is, someone who started playing videogames in the SMS/NES days might have formed a mental model of the controller being mostly a passive device, with at most a few active chips to multiplex the pins in the interface, to allow for more buttons than there are pins.

[unwind]

Sure (I was there) but the same can kind of be said about mice and keyboards, too.

Ever since USB took off ~30 years ago and basically killed off raw I/O pins on the front of computers, human interface devices have required microcontrollers on board.

Edit: added timeline.

[slim]

it is obvious in hindsight, but I never put a thought on it before reading that sentence