Had lots of sensors, plastic enclosure, removable battery... Great phone, very robust, fast, did not need to be handled delicately.
Then they made the enclosures glass. Now I have to handle a phone delicately and with considerable care. It's slippery! Wants to slide and hit the floor!
Next move?
Get rid of the headphone jack!
After that?
No SD card.
After that?
No removable SIM.
Now, it folds?
None of this makes my life better. None of it improves the robustness and utility of the device.
I bet the first company to make a robust, plastic case phone with all the good features put back into the product will do well.
People want the utility and robustness.
Why can't I pay more and get a flagship with everything? You pay more and get more features missing.
All they sell is flagshits.
Just makes the edges distorted and the screen much easier to scratch.
Scratches and the difficulty of solid cases is made harder. Screen films tend to peel up and collect grime and dirt.
It dramatically changed my phone usage habits. The super slim front display is just slim enough to be annoying to use, so I'd find myself checking/acknowledging notifications without finding myself engaging and becoming distracted as frequently as I used to. I also found that when I was sitting around somewhere bored, I was much more likely to start reading an ebook than before, as the form factor is really fantastic for that. My reading habits have dropped back off now that I've returned to using an iPhone.
Besides that, I can stand it on my desk with the screen towards me, which is very convenient when doing things on a computer and the phone simultaneously (like 2FA authentication).
Can't think of any downsides to a standard phone really.
I think durability and price are the 2 biggest downsides people will face with a folding phone. A third might be software support, but I don't know if the situation has improved over time?
There might be a secondary thing going on here too... I've had multiple tablets over the years. In theory I could use one as my everyday device. In theory I could take one with me in the field daily and it would be useful. In practice though, my current iPad is sitting somewhere collecting dust because a large-screen iPhone is "good enough" for those times I might otherwise pull out the tablet in a business setting, and when I'm doing "real work" I'm on my laptop anyway.
Apple has a long history of not necessarily being the first to use a new tech but the first to do it right/well. Of course there are examples of them failing/stumbling (Homepod comes to mind among others) but I'm very much looking forward to their "take" on a folding device. Right now it feels a little gimmicky and there is a potentially that we simply leapfrog that tech and use something better (AR?).
Granted I haven't really looked into it in the past year or so, and I'm not planning on upgrading my current phone for at least one more year.