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I can change my watch battery and maintain waterproof. Seems like a solvable problem.

The guys at the watch store would always warn that changing the battery could compromise the water resistance of the watch and, based on some bitter experience, not without reason.

Phones have much larger batteries and pack far more functionality into a small space than a regular watch. Hard to see how the constraints are comparable.

The battery size and device's functionality are the two most irrelevant factors. Water doesn't care if the thing has Bluetooth.

Whether it's a watch or a phone, you don't want water or moisture inside. Simple as that. Watches do have the advantage that they can be built so that they're 100% filled with a lubricating fluid, making them more or less immune to outer pressure.

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