I'll jump on the band wagon. Move over.

You would think that since people actually pay extra for this in SWtOR that it's a much desired feature.

Honestly though in the small 3rd person it doesn't make a whole lot of difference. Now if the game had a lot of close-up cut scenes like DAO, the hide helmet feature would be a must. With this game, maybe not as important but ... why not. If you go to all that work to give your girl wavy red locks you might as well see them right?