Such as?
I agree with the OP. Phones that are too big are not ergonomic to use. If I want to do some proper computing (rather than just email/online shopping/apps), then I will use a proper computer of some sort, not a phone.
Such as texting or posting on this forum. You can type more than twice as fast with two thumbs vs one. Even better, if you become comfortable swyping that can be as fast as typing or close to it. You aren't going to be proficient holding a phone with one hand and swyping. You'll hold it with one hand and use an index or middle finger of the other to swype. Then things like photo editing, you'll need two hands to do a decent job of that. Or scanning documents. Or doing calculations with the calculator app. Sure you can do it with one hand, but not as well if you use two. Using a weather app during a storm to zoom into your position to see from the radar if dangerous weather is headed for you. Or using a spreadsheet or word processor. All of this is easier with two hands and easier to see with a larger screen.
Now you may say you'll use a proper computer, and not a phone, well that proves my point. Away from home or traveling when there is no proper computer available you can do these things and more with a phone. You'll do them better using two hands. You'll be handicapping your phone's usefulness if you don't. Whether you will ever use your phone to its potential or not there are millions and millions who do every day. That is why smaller phones are scarce. The larger market is in larger phones. For a substantial portion of people today their phone is their only personal computer or personal computer like device.
I do wish there were more smaller phones on the market for those who want one. I think the cost vs profit ratio is too small so small phones are a red-headed stepchild. One mode I'd like to see added for older people or those who don't want much more than just a pocketable phone is Pure Phone or Pure Phone and Text mode. Like airplane mode, only once you engage it the device does nothing other than act like a phone. Everything else is disabled and not cluttering up just talking or texting on the phone.
PS-if you have never cast the screen to a regular monitor (or connect via the USB C port), and used a bluetooth keyboard and mouse, you'd be surprised perhaps how ergonomic that is. If more people did this, they really would not need any other computer.
