I once believed that strength training for distance runners could be minimal and weights were very overrated (note: that was originally written over 20 years ago). As the article I linked to in that post makes clear, I was far from alone on my belief and the science then painted a different picture (studying largely different exercises) than current science does.
As knowledge has evolved, so has my belief. This is how things are supposed to work.
I see many runners and, sadly, some coaches who unfortunately don’t do this. They believe what they have always believed and won’t be convinced otherwise. They don’t look at new evidence and grow from it.
Don’t be one of these people. Be skeptical of new information and ideas but don’t ignore them. Consider them against what information and ideas you already have. Consider how they might change your understanding and how they might be used to improve your running.
When your consideration of all facts, new and old, suggests that a modification of your viewpoint is in order, celebrate the modification. You just used knowledge to find a better way. I know that, in certain areas, changing your viewpoint can be viewed as a very bad thing. However, the truth is the exact opposite. You shouldn’t let every little thing change your viewpoint but, when the majority of evidence points in a different way than it has in the past, you’d be foolish to not weigh that evidence and change your mind accordingly.