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Are these for garage doors and doorbells? Those devices could definitely use more security (it's not hard to stuff a proper TLS stack in a microcontroller but manufacturers balk at even putting something as cheap as a ESP32 in their BOM).

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Also for currently-constrained platforms for which hardware updates are infeasible, software updates aren't, and cryptographic security is currently compromised due to lack of availability of appropriate constructions.

You'd change the coin cell in an ESP32 powered garage door fob monthly... Unacceptable to most.

Any remote control's microcontroller would be in deep sleep most of the time, and computationally expensive key exchange would be rare.

I have a few of these ESP-8266 remotes, and battery life is fine. https://github.com/mcer12/Hugo-ESP8266

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