Transform Android to Linux

Here is the idea i came with, we can transform phone's Os to serve functionality of both a phone and a PC.
Most of you know about Kali nethunter , a great Os to use phone as a hacking machine. Kali NetHunter Desktop Experience (KeX) to run full Kali Linux desktop sessions with support for screen mirroring via HDMI or wireless screen casting.
The similar feature is seen in some samsung phones too. Why not someone should build a Android Os with unlocked Linux possibilities. Or Google should implement Chrome Os to Android device with the functionality of running desktop sessions with support of HDMI. No one would run for purchasing a PC for basic needs. Even this would work great for a student.