I'm reminded of a Tim Minchin quote where he said he isn't funny enough to be a comedian or gifted enough to be a musician, but he can be the funniest musician and the most musical comedian out there.
There's something to be said for having an interesting combination of skills even if you don't maximize any one of them.
I recently finished writing a giant book. I wrote it all, hand drew the illustrations, and typeset the whole thing. I'm not a particularly talented artist or designer, but I have the unique property of deeply understanding the source material. So even if the illustrations and layout aren't the best, they are informed by the source material in ways an outsourced designer wouldn't be able to do. When I draw a little diagram, I know which boxes to make biggest because the concepts they represent are the most complex. When I choose to split a snippet of source code across pages, I know where to split the code to be least disruptive.