Because Paleo isn't a reenactment.

Because some people can't digest starches.

Because some people like green vegetables.

Because not everyone has time to graze on small amounts of meat all day.

Because not everyone's digestive system does well on small 'meals' throughout the day.

If i lived in the forest and didn't have to make money or pay bills, i might just run around all day and hunt small game and eat roots and berries. But fortunatey or unfortunately (depending on how you look at it) i live in a house in modern society and need to buy most of my food. So i adapt to my surroundings... Like s good hunter/gatherer.

This is how I instinctively eat, although it's taken a long time , three years of paleo to get there. The difference is not actually that I eat less, but that I eat more. I eat once or twice per day now, whereas before, even before my beer-laden days, I would struggle to eat every day. I eat when hungry, mostly veggies, then some meat for dinner, with veggies. I have little appetite for dairy, as it upsets my stomach, and sugar-laden desserts are truly unappealing. I do love salt and fat, though. I don't know what causes some people to instinctively eat like this and others not.

Definitive statements as to a true HG lifestyle will always fall down on lack of evidence and variety of lifestyles adopted by HG in different habitats. For example 'charred meat' may be one way of cooking, but what about buried food, fire pits, or wrapping food in leaves to cook it?

Whilst it is impracticable to do a reenactment,it is valuable to add in what you can of HG lifestyle to your everyday life. It does not have to be an either/or thing. In the summer I fish at least twice a week and myself and my family eat the fish I have caught. In the autumn we go out an gather wild berries. I am sure it is no accident that these are some of the most rewarding activities that we engage in.

Regarding it as a continuum rather than sharp HG/Neolithic division is more helpful in structuring and guiding your life style, so it is still a valuable question I would say.

So should we get around in loin cloths as well just to be authentic?

remember Paleo is a guide :)

Lets not forget activity, bacterial and climate exposure - to maintain authenticity you would not only want to emulate dietary habits but also activity levels and types, exposure to unwashed foods and the environment including temperature extremes without the aid of climate control and most clothing.

We aren't HG's, end of story. No matter how hard we try to emulate their diet or eating patterns, until we start going out into the woods to pick berries and hunt Mastadon with spears, we're failing in our attempts to be HG's. That's not the point of the Paleo Lifestyle. The point is to consume foods that our bodies have evolved to successfully convert into energy and use efficently. That's my opinion anyways, I'm certainly no nutritionist/paleolithic historian.

I don't eat a lot of vegetables. I mostly eat meat. I eat some kind of meat, often with some kind of vegetable but sometimes not, for breakfast. I eat salmon for lunch. Sometimes sweet potatoes, too. I eat meat and vegetables for dinner, but not usually a lot of vegetables. On a recent backpack trip I ate pemmican for breakfast, beef heart jerky, candy and dried fruit for lunch, and a stew made with either coconut butter or pemmican and dehydrated sweet potatoes for dinner. We found wild mushrooms, dandelion greens and chives and I put those in my stews. We typically ate about 4-6 times a day on the backpack trip. Maybe I'm not eating completely like a hunter-gatherer, but I sometimes come quite close and I feel good eating that way. Sitting at a desk it's hard to eat as many times a day as when backpacking. Depending where you are out in nature you may find lots of wild greens and mushrooms right now or you might not find any. Those things are very seasonal.