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IIUC, in 2021, you can dock a PineTab or a PinePhone with a USB-C PD hub that has HDMI, USB, and Ethernet and use any of a number of Linux Desktop operating systems on a larger screen with full size keyboard and mouse.

The PineTab has a backlit keyboard and IIUC the PinePhone has a keyboard & aux battery case that doesn't yet also include the fingerprint sensor or wireless charging. https://www.pine64.org/blog/

This already exists: https://ubuntu-touch.io/

It's mostly dead at this point.

The list of devices includes phones as recent as the Oneplus One. [0]

[0]: https://www.ubports.com/devices/promoted-devices

Take the state of the project as a market fit test of the idea?

Have you tried Samsung Dex?