In the fitness industry things are constantly evolving (as they should be) and always changing. Which is part of the reason why I think as Strength and Conditioning Professionals it is so important to have sound principles but to understand, and be open to changing your methods (as long as they fit within said principles).
This is also why I think it is so important for continuing education in this field. However, that being said I think it's easy to get overwhelmed with all of the new information that is out there, and sometimes I think we forget to appreciate, and apply what we know, and become too focused on what we don't. A paralysis by analysis, of sorts.
Here's a secret, the best in the industry don't know it all, and they are the first ones to admit it. Personally, I think if you meet someone that "knows it all" that just goes to show how little they actually do know.
Maybe we should start to think like first responders. Almost everyone has taken their first aid certification at some point or another, and part of the course is understanding that you can only deliver to your standard of care, meaning, you're not going to try to save someones life with surgery if all you've ever been trained with is CPR.
So, lets deliver what we know to the best of our ability now, with the understanding that things may change in the future as the industry, and we (therefore, our standard of care) evolve.