Problem is you'll eventually reach a point where the problem is deep and requires them to escalate, and if you aren't checking the box of tested customer cpe they'll stop. Example of this is when I found a Comcast backbone link with an incorrect/inconsistent MTU setting. Had to go back channel in the end to someone on the ibone team, but I had no chance in hell of getting that fixed promptly via regular support.
> you'll eventually reach a point where the problem is deep and requires them to escalate, and if you aren't checking the box of tested customer cpe they'll stop
I've been a Comcast customer for more than 20 years (in two different states) and have never encountered a problem like this, so I expect such problems are extremely rare. Every issue I've had has been of the kind where Comcast's support person can see right away that there's a problem on their end because they can't even see my cable modem's status even though I confirm to them that it's powered up and the cable is connected (and of course I have to go through the dance of rebooting it multiple times before they'll be satisfied). Most of the time they put me on hold for a while and then come back and the problem is fixed (I assume because some tech in the background rebooted or reset something that was borked). Once they had to send a tech to my house and it turned out there was a bad connection in the junction box they had installed outside.
