Choose wars based on strengths & battled based on weaknesses

It's slightly unclear whether the OP is talking about risk assessment and reducing unknown unknowns, or simply advocating becoming more well-rounded in your problem domain.

Also, I would argue there's much more to consider before offhandedly determining anything you don't know "is the riskiest part of your business". The real answer probably lies in the question: Can I hire somebody to do this, or is it important enough to distract us from other goals? If yes then do it, otherwise reconsider when resources free up.

"Choose wars based on strengths & battles based on weaknesses" - the title of the post makes more sense if you just Copy and Paste it... ('battled' in current title)