But if we want to achieve tried and true practices, we need a stable foundation. If we want to get stuff done in terms of solving actual non-software problems instead of navel-gazing, we need a stable foundation. There's a tension there.
That's why sometimes worse is better. Sometimes you're just building a toaster, not doing basic research on the temperature properties of wires with electrical currents.
So no, we should not always be brave. But I hope at any given time, there is always some non-empty set of people being brave.