I don’t agree with the OP that removing the jack is a mortal sin. However having worked in related induatries, I don’t think removing it really saves much if any money and it is entirely possible to make a phone or any other electronic device water resistant even with a headphone jack. Hell you can get wired ear buds that can be submerged in water.

I know it wasn’t mentioned specifically, but even fairly cheap watches will be water proof to like 30 meters and still have a user replacable battery.

I just wish companies would be honest about it.