you could make arguments about it taking resources from other development - but that's a tricky claim. when a company decides to serious expand their offering in such area (and one that presumably would expand the reach of the game and make them more money)they will simply hire more staff.
Well that's exactly the "problem" here - Larian Studios is a new, fresh, small team... They don't have or get millions to take a chance (not yet anyway <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> , or at least, so I presume <img src="/ubbthreads/images/graemlins/think.gif" alt="" /> )