Correct, not the same technologies. It's a much simpler circuitry. Very specialized doesn't mean very complex. A hammer is very specialized too.

I read somewhere that SoC boards on today's phones still have FM tuning capabilities, but they just don't use them.

I'll try to verify that, though.

Edit: this link seems promising: https://www.makeuseof.com/tag/how-to-unlock-fm-radio-hidden-smartphone/