From what I have seen where I live, printed passwords on things like home routers and VDSL/Fiber modems provided by major ISP's are for 802.11 stuff (WiFi passwords) and not for the devices management interface. This may have changed since I last looked into it a few years ago though. There was also the whole Netgear router "backdoor" port thingy (a device shipped by a major ISP) which I actually had to exploit to recover my password after forgetting it once, which was kind of amusing.
