I have been looking at Linux on phones(Ubuntu touch) with the intention to use it both as smartphone as well as desktop replacement. It really fascinates me. But it looks like there is no hardware anymore that supports display out and USB dongles. Why are there no up to date phones that have convergence mode?
Absolutely, and there are even some nice laptop shells that are just a screen, keyboard and extra battery that you can connect to your phone and use it as that.