There are still phones that have it. Sometimes even pretty good ones. It’s just that they are not advertised so heavily. I recently learned about HTC U23 or 24 or something. Now I feel dumb because I never bothered to check because I always thought all good phones don’t offer headphone jacks anymore.
The guy who wrote Winamp Sold it decades ago. So you should clarify who is defensive about their code :-) The original coder is really good - he also wrote the awesome AVS visualization plugin for Winamp which among other things utilizes a special programming language called “eel”. After selling Winamp he went on to create Reaper which also uses eel I think.