How many people out there would really go ahead and handicap themselves with a gnome sized berserker, besides maybe you and me? I would think it was hilarious and I'd do it, but why not just roll an Orc?

Giving Orcs another limited race though would be phenomenal, let me roll a troll mundunugu, an ogre mamlauk, or kobold/goblin skrugga the adaptations have specific stats they rely on so having a limited race for that adaptation would make sense. It would definitely make some people who all think Orcs are terrible roll them and have a larger base.