So I wouldn't call it a "just works" technology as it is far from perfect.
Converters only make the problem worse, because now you have a fragile USB-C dongle sticking out and a 3.5mm jack so it's extra bulky and prone to damage.
The wireless ones bug me to no end. Two more batteries to manage, two more single points of failure. Maybe I should dust off that old walkman.
But perfect it isn't.
I'd choose a smartphone that offers wireless charging because that is the state of art and it just works. It makes my life easier. I can just rest it on a little charging pad and move on. No worries about broken cables, broken USB ports and whatnot. Yeah, maybe there's inefficiency while loading, but we're talking about so little energy that gets lost, I don't really care.
Just like Bluetooth just works and makes my life easier. My little Anker earbuds charge in their case, they can live in my gym bag without getting lost, sound quality is fine, no connection issues at all, even across the gym (like 20 meters) with dozens of other BT earbud users around. Oh, and the case also has three LEDs to show me how full the battery in the case is. Charge it an hour with a USB-C cable and I'm good to go for weeks.