Surely you mean to make more money by selling Bluetooth earbuds… the Motorola Defy was waterproof and it had a headphone jack.

I don't think so, unless they forgot how they used to make older phones waterproof whilst still having ports on them.

Mine (Galaxy Xcover 5) has a headphone jack on it, but is marketed as a "waterproof rugged smartphone", or essentially a "tradesman's phone". Basically you can fill it with dust and water and paint and sand and drop it off a tall ladder into a bucket of water. Oh, and you can replace/swap out the battery too.

Anyway, my suspicion is that any company saying they need to take ports off or stop you removing the battery "for waterproofing reasons" are not being entirely truthful.

They can probably do it easier and cheaper by taking away features, but they could still do it if they wanted.

I personally couldn't give less of a fuck if my phone was waterproof. That's literally never been a problem for me. The only time it would have been I had it in a dry box so it was fine. I use my aux jack every day. Thankfully Motorola still had an option when I replaced my last phone. Although I did have to give up having a removable battery and the IR blaster(which actually would have been handy a couple weeks ago).