In a lot of aspects the limiting factor of using mobiles as workstations is the software and OS, you can add a Bluetooth keyboard and mouse then cast it to a screen but all you will get is a bigger phone and not a workstation. Mobile CPUs are not that bad nowadays.
8 core 2.8 Ghz, 11 GB RAM, 256 GB storage, liquid cooling, camera zooms at the level of a toy microscope. This is more powerful than some gaming PCs just a while ago.
It runs fine, but any less gets laggy, so I suspect apps like Facebook and TikTok are just going to continue to swallow up any more power.