I'll alter the zoom almost every time I shoulder the rifle,
different light conditions alter the view so low light might require a slight drop in mag,
when garden 'plinking' I set the mag so that the mildots match a ring of the target to ensure it's dead centre, & as I use several different target layouts that requires adjustment.
While high mag to check the holes can save a lot of time, unless you also use a spotting scope.

As per the OP, when scanning an area hunting, I'll use a lower mag, & then zoom in to ID any potential target, trying to follow a squirrel running through tree tops at high mag is next to impossible.