There's no 'risk' involved unless one licenses Le Marteau sans Maitre for the latest Jennifer Aniston film. With my limited (compared to Hollywood) experience, I can remember of no exception to the rule stipulating that the director always looks to the composer to enhance/enrich/punctuate/complement, even decode, his film. Everything else is pretty much done except the soundtrack, and no director/producer I've ever met, ever had the attitude "Ah, this will do, don't sweat it...". They always put the best possible music to their film they could get their hands on; OR, to come to a point I will always hammer (pun intended) - they always put what they thought was the best possible music to their film.
Face it everyone! With few exceptions, directors and producers today have the aesthetics and sensibilities of a skunk. It's not the streamline industry or the irrational deadlines (not that those help). It's that they just don't know the difference anymore, period. You can tell when you watch the 'Special Features' of some mega-production where you see the director/producer going into raptures about the recording session, beatifying the marvellous composer who "knew exactly how to capture that particular moment" - while you hear the most basic pads and voice leading - "the film was in jeopardy before the master came and saved it" - loud percussion clichés triggering the basest and most colourless subconscious reactions, etc. etc. etc.