All systems go for take-off
Pilots and crews are busy enough in the final few minutes before takeoff. You are talking about adding another technical check at that busy time.
I would rather they do that check before they trundle down the runway and find themselves up shit creek during take-off. It shouldn't be an overly onerous or time consuming check; probably just checking whether the "out of kilter" light is red or green. It's not like we are asking pilots to do something pointless. And lives are at stake, including the pilots' own.