We are planning to sell two older laptops and buy a new one for
my wife. Then I can get a decent monitor hooked up with a RPi 3B+
to use in my office. It will mostly be running a light-weight
terminal (maybe urxvt) so speed and responsiveness should not be
an issue.

This setup is possible because for the last few weeks I have been
working on the SDF MetaArray and make it a working environment
for an editor and a writer. I compiled the newest version of
Emacs stable on it, and use that as my main computing/writing
environment. Due to the portability of Emacs and the ubiquity of
SDF access, I can say that my work flow has finally become almost
hardware agnostic -- although fast internet, a decent keyboard
and a nice display are always preferred.

As a result, I have changed the way I look at productivity
devices. The ideal computer has changed from powerful boxes to
portable ones with good connectivity and good I/O setup.

Software setup has also become simpler. I don't have to install
30 pieces of software on every computer that I work on. I just
need to configure the keyboard, and maybe install a colorscheme
for the terminal (Solarized Dark is a classic). I only have to
maintain my software and dotfiles in one place alone.