While I feel Pi 4 is a good compact PC, I have to admit there is certain level of learning curve there. So unless one is comfortable with messing around in a new OS, I will not recommend a Pi. This is based on my own experience.
For TS, even a cheap Android box will suffice. Of course when using MS Excel, don't expect it to be as quick as a full fledge laptop/ desktop. Also the limited amount of ram may be a problem.
I beg to differ...
Raspbian installation have come a long way and it is very simple to install.
1) Download and unzip the "Raspbian" image from the Raspbian website
- download Raspberry Pi OS (32-bit) with desktop and recommended software
2) Download and install balenaEtcher
3)Plug in your uSD card
4)Launch balenaEtcher, select the Raspbian Buster, your uSD card, and then click Flash.
5) Insert the uSD card into the Pi, connect LAN, HDMI to the TV and you are off to the races...
It will boot into GUI where all the required apps such as Chromium, LibreOffice..etc are already installed.