I surely used the wrong word, danger, when I expressed my feelings there. I should have said, a destruction of a trip, or a situation that ruined the planned dive. Believe me it has happened to us. And yes, you are right; we would never take that attitude and try to conserve air. We both know what we need to do what we want to do; and that is the point Im saying that a short fill can ruin a day, weekend or even more.
I can agree with that.
But I check my fills on site at pickup and ask for a top off if it was done some time ago and the tank feels cool and pressure is low ...or if it just was done 10 minutes ago, pressure is nominal, but the tank feels quite warm. The latter may be the harder ask, but checking and asking so far works for me. Worst answer I ever got was somethin along the lines of: "can't overfill, shop rile, but if you can wait an hour or even half, we'll top it off".
And of course I learned that not checking and trusting just does not work, not even at the good shop.