„Legacy“ headphones? They are just... headphones. I’m sure that long after Bluetooth has become an obsolete and widely unsupported protocol, and long after all the Bluetooth headphones like AirPods and others have died from failing glued-in batteries, good old normal headphones will still work fine, with any device which can output analog audio at suitable power. (Heck, given their incredible resilience, my old AKGs might still work then too.)

Currently it's more like normal headphones that everyone uses and weirdo lighting headphones that only Apple uses.

This Apple dongle fetish is a usability anti-pattern, it can't be seriously suggested that we attach all sort of crap to our devices so that they continue working with Apple products.