I don't know, I seem to be in the minority according to the comments here, but I like my default credentials, thank you very much. I have tons of gear laying around, some of which is collecting dust in a drawer, and if the default creds don't work I might be in a bind because I'm not organized enough to "do it right". These devices are not open on the internet, obviously, and per my threat model, anything on my local lan is deemed safe.

More importantly perhaps, I am willing (and actually want) to have the freedom to do this, and to take responsibility for any problems I might cause for myself.

This issue is part of a more general ethical conundrum spanning many areas of life: How much should people be protected from themselves? I guess my personal answer is, not a lot.