Is there any feasibility for the next generation of handheld machines?

From ns to steam deck, in order to have a better game experience, the handheld is getting bigger and bigger, and it may be difficult to call it a handheld if it is bigger.
Therefore, if the screen, audio, battery and other functions of the traditional handheld are allowed to be borne by the mobile phone, and the rest is made into the handheld, will it be smaller and more portable without affecting the exclusive strategy of the manufacturer?
Ask the bosses if it is feasible? On a whim, the bosses spray lightly.

Play the game can stretch open

The combined form is such that it is very small and does not take up much space.

Four middle sliders for fixing