i dont know why all 3 body types are not available at the start of the game. surely if they all have there pros and cons its makes no difference. i mean at the end of the game all 3 will be available to you so will that make the game unbalanced. no so why not give us them all right away.
With the Medium you'll get the ''balanced'' health and weaponry
Then when you're used to the gameplay and know what you're doing you will eventually get the other two, the Light being the last due to him being the one dying the fastest and having the smallest arsenal of weapons
If you were in the mind-set of playing as a Light from the start and you ended up dying over and over again, would that be as fun as playing as a Medium from the start with bigger chances of survival due to more health and more default weapons?
Giving us the Medium first and having to level up to get the other ones sounds perfect, let us get some meat on our bones before we start going on a diet of vegetables and air or hamburgers and lard