I get that it’s expensive for Comcast to roll trucks, & that many problems are with a user's own equipment, but with pretty much every interaction I've ever had with Comcast, the impression is that the sole job of the agent is to get you off the line, and they only want to create the illusion of tech support. (And, for what it's worth, I've had Comcast roll trucks about 3 times in the last 5-7 years, and every time they found an issue outside the home, in the neighborhood, that fixed our issues)