I think they're experts in routing cables in very tight and uncomfortable spaces like attics and crawl spaces. They would often want to route stuff directly through a wall rather than in-wall because it's the easier to do the former. But I appreciate their expertise in this area. Connecting stuff to MPOEs and NIDs they definitely know that stuff. How to tell if the wiring into a premises are electrical or telco, yup. Splicing fiber, definitely. I'm surprised they're paid that low because I've asked a contractor how much it would cost to route networking and video cables in a home and I was quoted $4500 for 20 drops.
But in terms of hooking stuff to an enterprise switch, I have doubts most of them know about VLANs and stuff like that.