But what about in a startup?
When you're bootstrapping, your timelines are short and you need to quickly course correct. You have to be able to not only come up with a game plan for the sales channels to work through, offerings to provide and marketability of your solutions, but you also have to be able to actually test out your ideas, find their flaws, correct and try again.
In a startup, especially the early days, it's not enough to hand it off to someone else. You have to be able to make decisions fast and correct the direction, and to do that you must be in the thick of actually doing what you planned.
Come to think of it, unless you plan on moving slowly in a slow moving behemoth of a company, even in larger firms you can set yourself apart from all others by engaging in both strategy and the delivery or execution of that plan!