I fully agree about the overall downward trend in quality and efficiency of GUI apps, but I also think there's an important factor in the rise of TUI apps:

People now have access to good terminal emulators. Back in the day, you had cmd.exe in Windows. Now you have a plethora of Linux/Unix terminal emulators, Terminal.app in MacOS, and Windows Terminal in Windows 10/11. These are quite capable applications able to render good, complex text-based interfaces.