Good point--with a mil mil at longer ranges generally I'm better off doing a hold-over as opposed to click adjustments as it sometimes ends up a game of going back and forth across the intended point of impact.
Don't confuse the choice between manually dialing or 'hold-over' shooting, which relies on having figured out at what distances the smaller horizontal dashes on the verticle reticle line match target impacts at
known ranges (300yds; 450yds) beyond your base zero (e.g., 100-yds) with the Mil/Mil versus Mil/MOA hybrid issue.
Known holdovers on the reticle can work with Mil/Mil, MOA/MOA, and the hybrid scopes. Holding-over and firing is a question of
speed - whereas dailing up takes time which you may not have in the field. Shooting casually at the range or in some LR competitions is different, so you may have time to calculate and dail.
Holdover shooting is what you do when you don't have time to dail. Knowing your reticle's hold-overs is especially useful in hunting where a critter appears beyond your base zero (100-yds), since it may not wait around for you to dail.
In fact, on deer, hogs, and larger size game, it's even easier if you've previously determined the Maximum Point Blank Range (MPBR) of your particular rifle/cartridge combination. Say your MPBR for a 150gn 30-06 from a 22" barrel is 300-yds, the distance within which your bullet will not rise nor fall more than 3" either way.
Just plant the crosshair directly on the critter and shoot if it's within 300-yds. No holdover needed.