Rules are important, but they aren't the most important thing as a GM.
The 2 things that are more important are: pacing and fun.
Not fudging dice is important, but if it is in the way of fun, then I either just not roll or only pretend to roll.
Same with pacing, if a roll is going to bog down the games pacing, making everything take longer for no reason other than the roll, then that roll does not matter.