Everyone knows the third hardest part of building a company is making products.

Everyone knows the second hardest part is figuring out what products to make.

Everyone knows the hardest part is finding customers who are actually buying your products.

I'm not saying the easier tasks are unimportant but if you don't solve the hardest problem your business won't go anywhere, no matter how good you are at the first two. Meanwhile someone with a good sense of business can often delegate the first two to someone else.