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There actually was an Android based device that did this years ago. 2011/2012, I think; you could connect the phone to an external device that gave you a mouse, keyboard, and screen. The only problem was that the external device was something like $300 on top of the phone.

Edit: https://www.amazon.com/AT-Laptop-Dock-Motorola-ATRIX/dp/B004... - Motorola Atrix Lapdock

Samsung is advertising that usage when promoting the current Galaxy phones

You're right, here it is.

https://www.samsung.com/us/explore/dex/

What about the Intel compute stick and similar?

Can't use it as a phone. The all-purpose compute device is the shtick they want