Yeah, I've worked at another large tech company who had accumulated a lot of in house tooling with a lot of invested SMEs who had been there a long time and missed that the state of the art out in the world had passed them by.
I left FB in the early-mid 2010s and can attest to this. It took a year or so to adjust to the "real world." Things like, no, you don't have a fancy scheduler; you get SSH, ansible, and systemd timers. Docker, Jenkins, and Kubernetes (RIP Mesos) were all new to me when other devs/devops folks had years of experience.
