It's true but you might not need that many. Our house was built in 2000 and every room is wired with coax but no ethernet. With some strategic placement I was

It's true but you might not need that many. Our house was built in 2000 and every room is wired with coax but no ethernet. With some strategic placement I was able to get a hardwired switch in my office + two hardwired wifi APs with just two MoCA adapters - $300 well spent. It would be pretty expensive to turn every coax run in my house into a hardwired ethernet switch but well placed hardwired APs obviates the need to do that.