So why not just become a West Coast offense now that you have a QB who could handle it? Because no one else on the team knows how.

Just like a business, every football team needs a mission. Something that you move toward with every decision you make. You hire coaches based on their expertise running particular formations you're building your team around. You're drafting lineman out of college based on their familiarity with and how they would fit running certain schemes.

It's not just about utilizing whatever's available. It's about building toward something. Now you can argue that they should change their mission statement. But, that's a bigger process than just saying it.