Rather than addressing the unknown, FearOfTheUnknown is often the result of focusing on the fear.
It is normal to question new practices.
In software development, often a quick experiment would change the fear into a solvable known quantity almost immediately.
Sometimes the fear is rational, sometimes not. FearOfTheUnknown often manifests as paralysis.
Rather than taking a look at what is actually causing the fear, FearOfTheUnknown often results in IfItIsWorkingDontChange (See also IfItAintBrokeDontFixIt).
This is a TriteExpression.
Cheers, -- JasonNocks
As all TriteSayingsComeInPairs, don't forget to balance with: