Many (most?) older retail businesses still use TUIs. They're reliable, consistent, and orders of magnitude faster than GUI systems. When I worked ar Sherwin Williams, I got good enough with the TUI that customers could rattle off their orders while I punch it into the computer in real time. It's absolutely crazy that a well designed TUI is so much faster. It turns out that if you never change the UI and every menu it…
I worked for a medium sized company who did work with Toro. We supplied many of their lubricants and they had TUI they still used on one of their machines to enter the orders from our company. It was the last of their legacy products, but worked incredibly well. We had very little issues ever with the system. Our Oracle ERP Net Suite? Had three people dedicated to making sure it ran smoothly. I still remember some of the guys I used to talk to at Toro were "lifers" who were always talking about how easier things were before all the SAAS and ERP software came on the scene.
The stories they had were pretty entertaining.