I don't have the patience to keep typing password every time I turn on the computer, it's just me who use it.
Even then, say if you had friends over, a jealous ex, someone who disliked you, a friend pranked you, the list could go on, it's rather nonsensical to have not even a PW on start-up (not having a go at you don't worry, just looking out for you). Anyone could access that at any time and make any unwanted changes to your system, this is a bad risk to undertake. Maybe just have a simple PW, which doesn't have to be anything major, better than no security on start-up.
The above is me looking out for you, so all good.
What browser add-ons do you use as well?
~LDogg