Consistency is a thing. Old windows apps often followed a style guide to some degree, that was lost with web (while it's also hard, as styleguides differ between systems, like Windows and Mac) and wasn't ever as close as Mainframe terminal things where function keys had global effects.
All of the major platforms have a HIG that tells developers how to maximize the experience for users. Webapps have dozens of ways to do things like “search”. Those who never developed for a platform with a HIG do not value it and keep reinventing everything.
The best oart was that it was entirely keyboard driven. If you can touch type, you can just read the paper and type away. The job was mind numbing, but the software itself was great.
Despite its obvious downsides, for people who do regular form input and editing, it's often better than the flavor of the day web framework IMO
I mean, I wouldn't choose to use it, but I get it
A few years later in college I worked there again and by that point they'd transitioned to a much slower GUI that basically just wrapped the underlying green screen system. The learning curve was slightly better, but it wasn't nearly as fast.
Purpose-built mainframe-based TUIs were amazing. We lost a lot in pursuit of colored pixels.