Some industries, at this point in time, should be using the same compute and toolkit in 100+ years.

My mechanic is using software he bought in the 90s, in an emulator, becuae why change? What's the point?

He enters customer names, he books appointments, he inputs inventory, he bills. Nothing has changed in 30 years, norhing will change in another 30.

It's barely a gui by today's standard, and works wonderfully.

Why transition to another POS system? Why worry about conversion of current data?

And the stuff he has is rock solid. All the new stuff he tried has bugs, and the bug fixed versions have different bugs.

You wanna be a hard core dev? Develop stuff that will be written to floppies and pressed to CDs, with no internet for updates.