Nobody hunts off a bench, and you can zero any rifle from prone with a back pack, which is actually a valid field position in itself. Benches only add the 'comfort' factor when zeroing.
If you're developing handloads, that's different. Using a rested bench set-up to isolate and determine the accuracy of a particular load in a particular rifle is where it shines. Once you've found an accurate load, and then zeroed with it, it's time to get the rifle and your butt off the bench and out shooting in field positions, with a sling, and to include much practice with off-hand.
Beyond that, shooting at targets off a bench yields little practical marksmanship value unless you're just there to kill time.
Once you're zeroed, the bench is no longer needed. Field-position shooting is where your skills are honed. The bench is a crutch for the lazy shooter.
Admittedly Bench Rest competitions are their own separate shooting sport, but I'm not a Benchrester.