The terminal menu driven interfaces were archaic but a dream.
You had help, everything was explained in manuals, they rejected invalid outputs. Now everything is close eyes, press enter and pray it works.
Siemens ISDX was what I worked with. To build a new corporate extension was something like option 5-2-1-1 ext code Y 2-4-7 and then 9 to confirm.
Simpler times.