"While the router is theoretically the customers problem and many have upgraded, there must be an enormous number still in use"
I was going to say the DIR-615 is hopelessly outdated, but what I see these days on Amazon is nothing like the boxy gray DIR-615 I used before I switched to a Netgear Nighthawk AC1900. And I switched because it chugged like no end when using encrypted WiFi, and its IPv6 support was inadequate.
