For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
I have a pair of cheap Skullcandy’s that have physical buttons instead of touch sensors. The buttons are basically impossible to use without smooshing the earbud into your ear trying to click it, but it also means it’s really hard to accidentally click them. Probably as close as you can get to dumb Bluetooth earbuds.