My last car could accept a double DIN head unit but I never put one in because then I'd lose any way to control all the settings in the car. And that was a car from 2014! The integration is even tighter now.
I don't know or care if "it's a thing anymore", there's an inexhaustible supply of existing cars with double DIN. My Subaru from 2017 has double DIN and I don't see any reason to own a more modern car than that.
This is silly. I have installed Android Auto head units into each of my last three cars. It costs a few hundred bucks and takes an afternoon.
I simply will not buy a car that won't easily accept a double DIN head unit.