I had DirecTV send their preferred installer (Ironwood) in the area. It was a Saturday appointment. I think the guy was basically hung over and didn't want to deal with an HD installation on a Saturday. (He showed up 10 minutes prior to the end of the four hour installation window also).
Of course I have no way of knowing what happened, so you could be absolutely correct, but it could also be that the guy was simply exhausted. Most installers are forced to work at least 6 days a week, and often given double the number of jobs that they could reasonably complete in a 12 hour day. A typical HD install takes 3-4 hours, yet it isn't unusual for an installer to be routed 4 AM and 2 PM jobs. Since this certainly means that several of those customers aren't going to get installed, the tech is almost always going to try to do the easiest jobs, or the ones closest together. You'd do the same in his shoes; it's survival.
Sometimes these guys just make crap up to get out of doing labor. This is probably a case of the installers getting hourly pay regardless if the install is completed or not. There should be more of an 'incentive' bonus for a complete installation directly to the employee completing the install.
Techs don't get paid hourly, they get paid by the job. This, in theory, gives them motivation to get those jobs in. But the reality is that when they are over-routed every day, the incentive they have is to do the easist work.
The *right* answer would be to hire enough techs to meet the workload, but the pay is so low, and the treatment of the techs is so bad that turnover is huge. At any time, about half of the techs working for an HSP have less than 2 months of experience. The ones that last are the ones who learn how to exploit the system, by taking shortcuts on the install and by cherry-picking jobs. The ones who don't do this either get smart and quit or they keep working until they can no longer afford to. Meanwhile the HSP makes triple or more from DirecTV what they pay to the installer.
DirecTV has recently bought out several HSPs, but they need to buy out the rest of them and completely redo the pay structure, because with the increased competition in the market, fewer customers are going to put up with the problems the HSP program has created.