Huh, what? Stop imagining and do the math with numbers, maybe Comcast is shitty in general and other metrics.. but still doing here regularly 2 concurrent video calls with sometimes Netflix on top without any issues... on 50 Mbit still! (also asymmetric btw, I may be undemanding, but so a bit wtf on reading that)
(Or Comcast cable internet? There is often more bandwidth sharing involved than they tell, especially upstream, or what does gig service mean?)