Think of carbs as supplemental fuel for your workouts. If weightloss/leanness is your goal then limiting carbs on off days can help. I feel really good with 100g of carb for every hour I work out.

I'm a big fan of high volume training most days, I try to train everyday for around 1.5-2 hours dependent if I make it to my local crossfit box. If Paleo hunters hunted everyday why cant we train everyday, we lost the spear and picked up the barbell :)

If they hunted every day, then they weren't very good at it. The more you hunt, the more you eat, therefore it made sense that during times where foods were scarce, rest and foraging predominated. The times when food animals were present probably resulted on a few hunts a week, enough to feed the tribe with little leftovers due to the lack of storing capabilities. Either way, 1.5-2 hours/day of high volume training doesn't necessarily equate to a hunter-gatherer lifestyle. It might, but the issue then becomes why weren't the hunts effective?