chima_p: OK, so you're looking for a simple response to a complicated question. Here it is:
If you're eating SAD watch your calories.
If you're eating Primal, eat to satiation and see how your body does. For most people their body/hormones will adjust and that formula works = calories don't matter that much.
If not losing your hormones/body etc. may need more adjusting so tweak your calories & ratio's and then see where you stand = calories may matter for you specifically
If still not losing look to hormone/thyroid issues.
It's not random, but you WILL need to experiment on yourself since we are not all the same.
For me they matter greatly, eating primal or not. Tried the primal way, with out watching calories, and I gained weight. I still eat primal but I'm back to counting calories and the weight I gained is coming off. Not everyone is the same.
Like I said before we are no longer debating the same issue.