A couple years ago, I got a bit of saltwater in my iPhone and the headphone jack failed. Since the next generation of iPhone (the iPhone X) was about to come out, I held onto it for a couple months and bought AirPods. I then realized this was Apple's real reason for eliminating the headphone jack. It had nothing to do with courage. It was about eliminating a deeply ingrained user habit so they could solve the problem…
I then realized this was Apple's real reason for eliminating the headphone jack. To do away with the point of failure that you so aptly illustrated by getting salt water in your phone? I wouldn't have bothered with the AirPods if my headphone jack had continued to function. That's you, though. There are clearly millions and millions of people who don't want wires.
That's Apple's point of failure. The rest of the industry (mostly) has worked out how to make a headphone jack water-resistant.