I mostly agree with you but am optimistic about the future of smartphones. We currently have some alternative operating systems like postmarketOS and Ubuntu Touch that can be used on select devices today. In 10 years I think the ecosystem will be much larger and more mature. Currently we just have iOS and Linux, but in a decade there may be OpenBSD as well, and possibly an order of magnitude more Linux distros for phones.

My dream is to have an OpenBSD phone that can be used as both a phone and normal computer. To use it as a "real computer" with an actual keyboard, mouse and screen, you could just plug those peripherals into the phone. Then take it with you and plug in someone else's mouse etc. if necessary when traveling.