There are "choke points" everywhere along the line on cable because
cab;e internet is shared within a neighborhood. All ISPs use shared
bandwidth, even fiber.
That is one advantage of DSL. You own that whole channel, all the way
back to the fiber backbone so you usually get all you pay for, no
matter how badly your neighbors are pounding the connection. Cable
shares that channel with everyone on your node. (granted a much faster
channel)
Comcast is still running on copper here and once I get to the
distribution box at the end of the street my DSL is fiber. It is all
underground. Comcast is up on the pole suffering the slings and arrows
of outrageous weather.
Both still share that problem that they need to power the distribution
boxes
We have occasional Comcast outages. Nothing significant.