Pixel 8 USB C to HDMI in order to allow your phone to act like a chromebox

Not only Pixel phones does provide such functionality, other manufacturer(s) also provide something similar depending on the model. Example: Samsung does provide Samsung DEX.

It's not only providing a larger screen and you are mentioning the usage of Cameyo which also can be used on any other device and comes with additional costs.

This is a very one-sided view of this topic you posted here but i would just take the chance to raise here an integrated system by Android to have this functionality on any Android device available (if the USB-Port supports HDMI) would be definitely a big benefit for several users in companys.

But one thing you last out: You still need a keyboard and a monitor and maybe also a mouse to fully replace a chromebook/laptop. So you are only flexible if you have this available on your work places as you don't want to carry that with you along everytime 😉