I think it’s a neat mix of novelty and practicality that a lot of people are unaware of.
I use a TI-83 Plus and ripped my ROM using TiLP and now use TilEM on my Linux machine and Graph89 (available on F-Droid) on my Android device. The hardest part was getting a hold of a TI Graph Link cable.
Setup generally depends on your calculator and which device you wish to emulate it on (Linux, Windows, MacOS, or Android).
My TI-83 Plus recently died so I was able to find an old WabbitEmu download for my phone. A beautiful replica with the familiarity of ol’ reliable.
The matching familiar layout can sure save time versus learning whatever the landscape version of the default calculator app on your phone has to offer.
I used to use wabbitEMU on my phone to emulate a ti-84, but now I use the the HP Prime app and physical calculator.
I used to do something similar, now I use CalcES on my phone which is essentially an FX991ES emulator with modern quality of life features and graphing. Now I can’t imagine using anything else.