I don't agree. They're useless until they can call, text, and do video / camera reliably. With enough adoption, the rest will come, but they won't ever get adoption without nailing those basics.

Adoption will come only and only with essential apps people use every day.

And those apps get developed only if there are enough users. Catch 22.

Microsoft didn't manage to make Windows Phone a viable competitor against Android & iOS, and they're about an order of magnitude bigger than any Linux-focused company. I hope the conditions shift and an open phone OS can take off, but I don't know what would enable it.

Librem 5 can do all those things fine. Video is somewhat less reliable, but it works.