https://www.techspot.com/news/103597-apple-working-make-iphone-16-battery-removal-easier.html
Sources have told The Information that replacing batteries for the iPhone 16 will be somewhat easier. Although the process will likely still require professional assistance, Apple is...
Also, removable batteries and waterproofing are not mutually exclusive. There have been flagships that were waterproof and had a removable battery, like the Galaxy S5. And there still are phones like that. Manufacturers have taken this away from us.
Also, also, every other industry has seemed to have figured it out. Go to the dollar store and you will find a flashlight that is waterproof and has easily replaceable AA batteries. Its not that complicated. Apple is one of the most successful companies on the planet, they can hire an engineer to come up with a decent solution. Apple et al. using waterproofing as an excuse to make the entire phone disposable when, not if, the battery dies is bullshit.