My current setup is Fold4 with BT keyboard and mouse. This is what I use instead of laptop for work when traveling. It's not perfect but more capable than expected. DeX is surprisingly usable but mobile applications lack in some areas. Luckily most of my work is around code so getting Termux solves most of the issues. S7 Galaxy Tab should have pretty capable DeX implementation which doesn't require external screen to work. For me just foldable screen is good enough for writing code.

It really worked well for my use case during the pandemic. I was in a research lab and while I did most of my computational work from home, when I had experiments to do I would go in, and used dex to update my data spreadsheets and collect imaging, upload to our computational cluster and be able to run some basic stuff on that through an ssh terminal. I was just using Google sheets for my basic data entry. And I had a dock already set up there for my laptop, which had attached ethernet, a monitor, keyboard, and mouse. So I could just plug my phone into the USB c and have an instant solution that worked just like a computer and connected to the secure network over ethernet (which was required for the fastest upload to the cluster).

The biggest limitations was only being able to have 5 windows open at once, but for the limited tasks I needed to do, it worked well enough.