Blog: Wisdom From Wizards

Why Depth Beats Breadth, based on our collaboration with Ari Tulla, CEO at Elo Health

Written by Nitin Kartik | March 22, 2026

Many CEOs struggle to turn their ideas into a clear, compelling book that actually stands out.

As a 2X bestselling author featured on BBC TV and in Times Square and having collaborated with 70+ CEOs, in the next 60 seconds I’ll help you turn focus into a powerful bestselling book strategy. This insight is based on our collaboration with Ari Tulla, CEO at Elo Health.

In our collaboration with Ari, we arrive at a simple truth: trying to cover too many markets weakens your impact. The same applies to writing a book. When you try to speak to everyone, you resonate with no one. The strongest books dominate a single idea, a single audience, and a single narrative.

This is where most CEOs go wrong. They think breadth creates authority. In reality, authority comes from depth and alignment. Just like in business, your messaging must align across every “team” inside your book. Your story, your insights, your examples all need to reinforce the same core idea.

When that internal alignment is clear, your book becomes sharper, easier to market, and far more memorable. Focus is not limiting. It is what creates scale. And that’s why depth beats breadth.

I dive deeper into this concept of internal alignment and focused messaging on page 192 of my book Product Marketing Wisdom, which just completed 61 weeks on the Amazon bestseller list.