I do not describe something that is very un-likely to happen as being bad practice. Yes I am risk aware and do, when creating a risk assessment I do include consideration of highly improbable events that would have significantly harmful results if they did happen.
If they immediately freeze motionless until their eyesight becomes accustomed to the dark then an accident is un-likely but not impossible. Having a torch to hand when working in a loft is sensible at all times.
Yes I do see where Winston1 is coming from. Mis-use of a socket by using it to supply a load greater than the designed maximum load could have un-wanted, even harmful results, when the MCB / fuse cuts the power.
But that situation, as already mentioned, is a result of poor design of the installation and/or the way it is mis-used.