Less expensive scopes have a "catchall" setting that gives "adequate" parallax for the expected distances that they're operated at. Better scopes offer you the operation for you to adjust them more effectively.
I regularly find that I am challenged to correctly focus my scopes with the eyepiece so that the crosshairs are sharp when viewed against a neutral background - and that's the essence of getting other adjustments to function correctly. I'm surprised at your issue is with a NF BR, as that's the scope I own which I find easiest to get all the ducks in a row with. On the other hand, The slow eyepiece adjustment on my Leupold VX IIIs is darned annoying & I have yet to be able to dial out parallax & get a crisp crosshair. Further, as I use them out to 1200 yards, I've learned to live with only a sharpish, not sharp crosshair on them.
Incidentally, a sage taught me to stick a ring of masking tape around the tube of my Leupys & crank the bugger one way until the crosshairs obviously blurred, put a mark on the tube corresponding to that little dot on the eyepiece, crank her back until it happened the other way & call the mid point between them best focus.