Galaxy s5 proving waterproof phones with replaceable batteries don't need to bulkier aside, perhaps they might engineer phones to be a bit thicker but more durable so they don't need a gaudy case on them to protect them, so net they will actually be thinner.

I mean, it’s not happened yet… I’m assuming there’s a non-zero chance that the removable-battery (inferior) versions might be contained to the EU and the rest of us get access to models with non-removable (higher capacity) batteries.

> removable-battery (inferior) versions

Maybe its just me, but I'd happily trade raw single battery capacity for the ability to swap in new batteries at will.

Not only does it make battery replacements easier, you don't need to carry bulky power banks around as all you need is 1-2 spare batteries to swap into your phone and instantly be at 100% again.

If this is a product a significant slice of the smartphone-owning public want, then why isn’t it already on sale ?

Because its simply not as profitable as the alternative. Same reason why companies continue pushing subscription services despite the average consumer being sick of paying monthly for services(0).

[0] https://www.thedrum.com/news/2022/11/16/us-subscription-fati...