Somewhat related, Netheads vs. Bellheads https://www.wired.com/1996/10/atm-3/

I briefly worked at a place fully dominated by Bellheads early in my career. They were bemoaning IP and holding on to ATM stuff as late as 2001. I'm told that the last of their tribe (after I left) fought off VoIP as a passing fad well into the 2000s.