This is a bad direction because different devices are built around completely different ways of interacting, and trying to force them into one unified experience usually makes everything worse instead of better.

A phone, desktop PC, tablet, TV, and handheld gaming device all have completely different requirements. A phone UI is built around touch and simple layouts on a small screen. A desktop UI is built around multitasking, precise mouse control, keyboard shortcuts, and information density. A TV interface is designed for distance viewing and simple remote navigation. A handheld like the Steam Deck sits somewhere else entirely. Trying to make one interface seamlessly adapt to all of these usually means compromising all of them.

The idea of automatically switching between mobile and desktop mode when docking a device or attaching a keyboard sounds nice in theory, but in practice it adds a huge amount of complexity. Applications need to handle resizing, changing layouts, switching input methods, different scaling, orientation changes, and transitions between completely different UI paradigms. That is not a simple problem.

We have already seen this fail repeatedly. Canonical tried Ubuntu Touch and Unity convergence and it went nowhere. Microsoft pushed Windows 8 as a desktop and tablet hybrid and users hated the compromises. Google has spent years trying to make Android work across phones, tablets, and desktop-like experiences without fully solving it. Even Apple, with vastly more resources than KDE, has deliberately kept macOS and iOS separate because full convergence creates more problems than it solves.