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With some microcontrollers you can do this "averaging out" just by changing ADC parameters, you don't even have to write the low-pass-filter code.

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That is specifically sigma-delta type ADCs: https://www.analog.com/en/resources/technical-articles/sigma...

No, several MCUs, like a lot of STM32s, support hardware oversampling with optional division. Here's[1] a document describing it for the L0 and L4 series, which like most of the STM32 series have SAR[2] ADCs.

[1]: https://www.st.com/resource/en/application_note/an4629-adc-h...

[2]: https://en.wikipedia.org/wiki/Successive-approximation_ADC

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