A GoPro fits all of those requirements and has easily replaceable batteries. Now, I understand that the shape and sizes are different. But I wouldn't mind some extra mm of thickness (I already get a pretty big camera bump anyway) if that means I can replace a battery faster.

> some degree of waterproofing/water resistance

Can we have this discussion once? In this thread alone, there's like 50 instances of people making this claim and each time it takes about 20 minutes before at least one person replies that it's not the case, after which no refutals are posted. I'm happy to learn it is false if it is (I never had a phone that I trusted to be waterproof to any degree so I don't have first-hand knowledge), but it gets really tiring to read the same information level over and over as a reason for why we can't have nice things

Taking this comment as an example of someone who actually used a battery-swappable phone in rain on a motorcycle: https://news.ycombinator.com/item?id=47835184 (I'm not only taking the person's word for it: the device is also IP certified as waterproof 30 mins at 1m depth)

The missing part is "at a specific price point".

There is a lot you can do with advanced materials science but as you get close to the high end of capability the cost goes up very rapidly and the ability to scale production is reduced.

>people also want phones these days that are physically durable,

Anecdotally on this front, I have had to replace the screens of my iphones at least three times in the past (different models). Incidentally, I have never needed to replace the screen of a phone that had a replaceable battery. YMMV, but this seems needlessly defeatist.

>maximum battery life

One could also claim that bespoke charging cables allow for faster charging or longer battery life, but I don't know any iPhone users that are a crying a river for their deprecated non-standard chargers. But again, YMMV I guess.

We can make waterproof things that are attached with screws.

You severely underestimate the capabilities of modern electronics manufacturers. Sure, it’s harder to produce something that fits all those capabilities. But it’s totally possible. This is exactly the scenario where government regulation is critical to a well-functioning market.