A lot of good thoughts on this thread. I think the answer is definitely, "it depends," but I also think it's worth keeping mind that nobody ever thinks they're being "that guy," even if sometimes they are.
For what it's worth, when I was coaching, I ran with my kids some of the time. I had a few different reasons:
- Sometimes I was showing the kids new routes or trails, and I wanted to make sure they didn't get lost. I typically would be bouncing back and forth between groups on these runs, so I wasn't with any group for a long period of time.
- My program had almost died before I took over, so we didn't have any experienced upperclassmen to guide the new runners or to share running lore. If we had, I probably would've run with them less.
- I occasionally used easy runs to do the coaching that would otherwise have taken place at a meeting. For instance, I would run a few minutes with each of my varsity runners to talk about the next race. I wanted to make practice short so they could get home, get dinner, and do their homework. It also became a selling point in trying to recruit new runners that XC practice usually only takes an hour. I've always thought it was a bit nuts that lots of high school XC coaches want to keep their kids for a full 2 hours, when half that time is just stretching and talking.
- When it came to interval workouts, I was usually just using the clipboard and stopwatch, and I would only very rarely run with the kids. Usually it was because I had particular runners who just could not run an even pace, so I might do a few reps until they got into the groove. On only one occasion did I do my own workout at the same time--I did a tempo on the track with some of my milers doing every other lap with me. The correct paces were perfectly aligned, and it just seemed a neat opportunity that we could share that experience and have it be appropriately difficult for all of us. I had runners tell me years later that it was one of their favorite workouts.
On balance, they were still running far more without me than with me, and I did almost all of my own workouts solo, after the kids went home.