You don't ever really 'need to use' the waterproof feature on your phone. It's more insurance for most people.
I have personally known dozens of people for who'm it's saved their phone including:
- Dropped it in the toilet.
- Dropped in pool.
- Dropped it in the bath.
- Bag flooded when water bottle broke.
- Flooded when coffee cup failed.
- Rained out.
- Pouring rain on a bike ride.
- Pouring rain when needed GPS on motorcycles.
The above are things that happened both to people I know individually and also all of the above have happened to be at some point.
I don't necessarily like the lack of being able to swap out the batteries for a cheap replacement but I do like that waterproofing to a high degree should be a default feature for things like phones. It could be argued to get waterproof cases or keep it in a bag and that's all good and well (except the waterproof cases as they suck and break) but isn't it nice for the default to be that the device itself is waterproof if that was an option?
Even if this is the case, that's still pretty good. That means either it has to be waterproof for it to warrant being glued OR it has to have a removable battery. Forcing manufacturers to either improve the ingress rating on their phone or increase the usability and repairability. Still a good step no?