He's complaining that that code is boring and not creative, and that as a startup your job is to be interesting and creative. I agree with him.
Besides that, getting it done in a way that you can reasonably verify as correct and you don't have to rewrite (read: a maintainable way) means you get to free up resources for whatever you are ultimately trying to do with that code. 'Boring' code plays a huge enabling role for creative code and creative projects.
Finally, creativity may be something but it isn't everything; in the rare event that writing code in a way that gets things done or helps people does not provide enough scope for creativity, your activity is more in the vein of pure recreation or performance art, and you shouldn't worry at all about maintainability. Just know what you are doing.