Setting controls as accurately as you can greatly effect the flight performance of the plane. Some don’t care so much, that’s fine, and some planes are more forgiving than others. But consider this; move your aileron trim one or two clicks/beeps in flight and notice how the plane rolls. Retrim for level flight. Land, now watch your ailerons as you add the one or two clicks you did in the air. Notice the ailerons hardly move. Take away from this exercise that it takes very little misalignment to make a plane perform poorly.

I know the higher end more accurate throw gauges are expensive. Just use the best you can afford. And a quick FYI, it is easy to make a very accurate throw gauge that reads in fractions of a degree for under $5.

More than just endpoints/travel, you really need to be checking movement alignment across the whole throw range as mechanical misalignment will cause dual servo surfaces to track differently. I.e., both elevators move up/down the same amount at extremes, but at partial stick, they no longer match, i.e. one higher/lower than the other. Same thing can happen with ailerons, flaps, etc.