I honestly still can't imagine it, and I was playing with this kind of stuff in my teens as well. Changing default passwords is part of early setup fun, and not

I honestly still can't imagine it, and I was playing with this kind of stuff in my teens as well. Changing default passwords is part of early setup fun, and nothing spoils the fun as much as unwanted visitors in your network. I can imagine being distracted enough to actually forget about it, sure, but I can't imagine outright neglecting to do it because "fun".