Combining different skillsets can provide substantial competitive advantages. It is extremely difficult to make it to the top of any specific skill, but way easier to develop a rare skillset. After all, in real life, there often is a need for a combination of a sufficiently high level of skills instead of a single, extremely fine-tuned one.
Developing a variety of skills can provide more opportunities than merely focusing on one area of expertise.
Which nonfiction book you could read next, selecting one that is not typical for you?
How do the skills of your team members complement each other?