I agree with you for the most part, but there is value to the max - based on the level table, you'll make that decision 3 times, and having higher regen than max is useless - If your max is equal to your regen, then in some cases you have an animus you can't use that becomes effectively wasted over rolling it over. - There are some abilities where you can pay X animus for things, so it would let you get a bigger max for X if you saved animus or used other methods to regen it. Ranger using long shot + shortbow ability could shoot across the map for huge damage with enough max animus.