Yes this is another example of poor random advise given by people "not in the know".
What i find even more shocking is that when i turn up to a clients premises and they say "i've been onto Epson / HP / BT/ Telewest / MS etc etc for over an hour in total and X still doesn't work" i can get it working in under 15 with the simplest of things.
Real case - client has had problems with Self Install ADSL from BT. They tried everything on the phone, tested the line, changed the filters, got him to buy a new ADSL modem for £90 etc. In the end they said "get an engineer out" and hung up on him. I was called and after a 5 minute conversation with BT sorted it! The problem - they never told him he need to put a password in a certain field in the settings so it would never allow a connection!!!!