Dude, you had me ping something to show how they are like on & off all the time, but the fact is when I'm surfing and emailing and stuff, if I don't see it or notice it impacting me, then I don't consider it downtime. You may be doing some kind of uploads and downloads where it is a real problem for you, I don't know, I do know that what I consider outages that impact me are few and far between, and most are resolved by me re-booting my modem and router. Yes, there have been times where I've experienced the network being down and unavailable, but that hasn't happened very often.
Anything greater than 30 seconds and TCP will timeout. Anything less, and "normal use" will go unnoticed, besides being annoyingly slow. If you're just a casual web/email user, no, you likely don't care about "outages", but don't go redefining what an outage is just to make Comcast appear flawless.