Probably is better this way; if the levels are designed for a fixed camera angle, common sense dictates that general semblance would benefit from it. Zoom in/ Zoom Out is a cool feature, although normally not very useful for nothing more than looking closely to your characters and that new, awesome piece of armor you have acquired.
Saying this... not that in the videos we have seen so far shows to have this particular problem, but it would be great that camera angle offers a nice view for battles. A good zoom out feature would allow to make plans in the long run, for example.
