Respectfully disagree. Across the board. You should be able to slot your weapon without looking at it. I have holsters where I can't do that. They're in a box to remind me of what not to use. If you can't re-holster the weapon without looking, you need to find another holster. And my own experience has been that practice with whatever holster you settle on will cure any doubts.
As to standing around a defensive shooting situation with a pistol in your hand, the cavalry charging in, that's just suicidal.
"...A humble and contrite heart, O God, thou wilt not despise." Ps. li
"When law and morality contradict each other, the citizen has the cruel alternative of either losing his moral sense or losing his respect for the law." —Frederic Bastiat