My life is too valuable to save a few bucks by putting those extra miles on tires. Mine get changed when they hit the wear bars. JMHO. To each their own!
My school of thought also. Thin tires puncture easier, when I wait a year or a lifetime for a particular ride, I don't want to be held up by a tire.
"Extremism in the defense of liberty is no vice.
And... moderation in the pursuit of justice is no virtue.''
-- Barry Goldwater, Acceptance Speech at the Republican Convention; 1964