I'm not sure dust was ever really a problem for most people. Although, for those in sandy/dusty environments (deserts, some industrial situations, etc) I bet it was a problem.
More to the point, though: I don't think it has to be an either/or choice. Casio makes a crapload of 200M water-resistant watches that sell for $50 or less. This includes both plastic (G-Shock, mostly) and full-metal models (MDV-106/107). The secret is (gasp)... a frigging thin rubber gasket. I frankly don't see any reason why we can't have this level of water resistance in a phone.
We would have to sacrifice thinness and lightness, but not by much. I think a lot of people would happily make that trade.
You can't have the thinnest/sleekest possible phone and an easily removable battery. Have to choose.
Frustrating thing is, mainstream phone manufacturers don't give you a choice. There's no option to buy e.g. an a slightly more ruggedized iPhone that is 15% bulkier but gives you easy battery access. That's a thing I'd buy, even if it cost a bit more.
The quest for "sleekness at all costs" made more sense 15-20 years ago, when full-spec smartphones and laptops were clunkier.
Hopefully the tide is turning. Apple is offering beefier and thicker laptops (M1/M2 Macbook Pros) and likewise now gives buyers an option for a beefier "Explorer Edition" watch. No battery access sadly. But hopefully the pendulum might swing the other way a little now.
https://www.samsung.com/us/mobile/phones/galaxy-xcover/galax...
Edit: This is getting downvoted, but it's a regularly-updated phone line from a mainstream manufacturer with decent specs. You can absolutely vote with your wallet here as OP laid out.
Is this true? Plastic covers seemed thinner than the glass/metal shells that have replaced them. Also, from my limited experience, the batteries in the glued-together phones have adhesive strips that secure them inside the case, which again add a little extra thickness.
I could be wrong about those things, but I stand by my assertion that the plastic snap-fit phones were more durable. Durable enough that they didn't need cases for protection, which above all else rob a phone of its thinness/sleekness.
The first time I dropped a glued-together phone, I cracked the screen. I thought it must have been a fluke, since I'd dropped plastic phones tons and they'd always been fine. I was so sure it was a weird one-off I refused to get a case after having the screen replaced. My girlfriend called me an idiot. Two months later, I dropped the phone again. Now I have a case.
Phones currently can be dropped in the toilet with zero damage. It is a real benefit to have waterproofing. I would prefer waterproofing over easily replacing battery that happens rarely.
Second, it's possible to make the battery connections water resistant, so yes, you can have a water resistant phone AND have a replaceable battery in it's own compartment.
Similar thing with dust. Even though a lot of my phones in my teenage years lasted under a year, they always died with dust in their screens. Camping and riding bikes around dirt trails and what not can push a lot of gunk in those things.
I'm happy phones are a lot better sealed. It's a bit of a pain making it harder to swap the battery, but paying a shop $50 parts included to swap it and keep it sealed well is worth it to me. A replacement battery back then would have been like >$30 anyways, going by inflation that's not too much increase in cost.
Unless I forgot one, I think I'm on my 10th mobile phone in total since the late 1990s, so averaging just under 3 years per phone. And I think the interval was shorter in the feature phone days and longer in the last 12 years or so where I'm now on my 4th smartphone.
Maybe it's because I learned to be careful with my phones before smartphones existed, back when dropping it might mean the back cover, battery, and main body flying in different directions. As a result, I'm also the kind of person who might drop his phone/wallet/passport into ziplock bags if I was heading outside with a chance of significant rain...
Why not buy a $100 rugged waterproof case and an external battery?
Same here, but I don't pretend that my experience is typical.
Even if it is, and, say, only 20% of people end up dropping a phone in a toilet or cracking the screen, it seems worth it to build in water and crack resistance.
On a larger object, this level of precision is harder to maintain. Due to spacing between fasteners or other flexing/distortion of the body, the gasket could be overly compressed in some places and loose in others...
A 25% bulkier "rugged" iPhone 15 Pro would still fit nicely in most people's pockets. Unlike an encased iPhone plus external battery pack.
Like a lot of men, I carry a phone and wallet in one pocket and my keys in another. I don't typically carry a bag. Not gonna carry a battery pack too.
Also, an external battery pack achieves one thing (extended battery life) but not the other -- still wouldn't be able to easily replace the internal battery once it has aged out.