When the override ability is maxed (call mount) you no longer need to override. You simply whistle and a mount comes running. Depending on where you are on the map you get different mounts. The charger is the strongest mount in battle. Always having a charger available in the more difficult areas is worth the skill points IMO. Not to mention moving around much faster.
If you want to override something bigger you simply hide in the grass & whistle them over to you (lure call). Not much effort required.