SpaceX isn't to the point in this endeavor where they should be worrying about making things look "sexy". If there isn't an objective improvement in doing something in a non-flight-tested way then I'd be highly suspicious.
Though I agree making the interior sexy is not particularly important. I think a large portion of SpaceX’s success thus far is due to making space sexy and interesting to the public again.
Part of their mission is to inspire the next generation. So if it doesn't add to the cost or make it more hazardous, making it look good / futuristic can have a positive payoff if some 10 year old kid looks at it and decides to go into a STEM field and invent something cool.
SpaceX isn't to the point in this endeavor where they should be worrying about making things look "sexy". If there isn't an objective improvement in doing something in a non-flight-tested way then I'd be highly suspicious.