If you want to launch and grow a business, chances are you're going to have to put words on the page. Probably many words on many pages. Which means there's no room for saying you "hate writing" or "can't write."
In many cases, the more important the writing task, the more the would-be writer freezes up. The result can be something of a Mobius strip of anxiety turned into fear turned into more anxiety, and what you're left with is a blank page.