Comment by Animats

No, just practical.

The previous version was a panel of blinking lights called the "trouble indicator". When an alarm sounded, someone had to go to the panel and record by hand which lights were on. There were about 200 lights. So the trouble recorder, which recorded that info automatically, was added in larger central offices as an upgrade.[1]

[1] https://hackaday.com/2022/12/02/stack-trace-from-the-1950s-p...