E.g. https://en.wikipedia.org/wiki/Wikipedia:Chesterton%27s_fence
Questioning something doesn't mean doing away with it just because it's old. It means asking yourself (and others) if it still makes sense from today's point of view.
Not "mindless questioning" though, which is the kind I explicitly wrote about, and which amounts to knee-jerk rejection.
E.g. https://en.wikipedia.org/wiki/Wikipedia:Chesterton%27s_fence