I have the Leica,and I like it.
One use for them is setting up targets at known distances for sighting in,etc.
I have tried the route of
Finding game with binoculars
Switching to rangefinder,then switching to rifle.The technical way has merit sometimes,depending on your priorities..
But,suppose you have a 4x Leupold with a duplex that covers 12 MOA post to post,and we assume an 18 inch vertical brisket measurement.
If an 18 in target seems to fit a 12 in reticle,the range is about 150 yds.
From the crosshair to the post,is a 6 moa retical,so if that fits,its about 300 yds.
It is the principle of rangeestimation using a Mildot,adapted to whatever reticle feature you may have.
Now,very skilled and careful folks can use a Mildot to a 10% error factor,maybe we can do +- 20 % with a duplex.
That prevents gross errors,gives a way to know "too far"or "No holdover,shoot where you want to hit"
And,most 308 or better trajectories will forgive a 20% error in range estimation if we hold ourselves to a 300 something yd shot.
My point,lasers are great,but the "gear heavy" thing can get old.
Learn to use a reticle,and you can do pretty well with just a scope.