I get several job offers per year from my professional network, because I have been doing some things in the past where mistakes were bound to happen. Due to my expertise I am more likely to finish certain projects within time/budget/scope than others.
While it might be a long stretch, compare it to road cycling: who might have the best chances to finish a century (100 mile ride) within a reasonable time:
- someone who has read a lot about road cycling
- someone who has finished several centuries successfully
Practical knowledge tends to be way deeper than theoretical knowledge, and usually gives you the ability to judge whether the theory applies in a certain situation, or it does not.
You can not become a master chef by looking at TV shows, you need to walk the walk...