My experience: via iPhone 8 + Apple adaptor, it couldn't drive big cans, and even for earbuds they lose significant volume. My phone has the 3.5mm jack, and it can deafen me. This matters more when hooking up to sound systems because it raises the noise floor.
It's better than nothing, but it's not good. I don't know about the USB-C alternatives though - I can only hope they are better than the 'lightning' connector ones.
I know USB-C is more robust than MicroUSB, but that doesn’t feel like it’s good for the connector. I’d much rather have a bit thicker (Apple said they’re getting rid off the jack to make their phones thinner.) or a bit less waterproof phone (not having a massive hole in the phone helps to waterproof it), than to loose the headphone jack.
Powerbeats Pro have hooks over the ears and only get used when a wire would be intrusive such as workouts. I don't much like them but they are hard to lose. They're notorious for not charging properly and worked much better on Apple than Android, but at least I still both left and right buds.