Dan McKinley:
The problem with “best tool for the job” thinking is that it takes a myopic view of the words “best” and “job.” Your job is keeping the company in business, god damn it. And the “best” tool is the one that occupies the “least worst” position for as many of your problems as possible.
Shiny new tools are irresistible and can sometimes solve problems in a better and more elegant way, but most times a proven and limited stack is what you need.