Always do this?

"When we discuss how to design enterprise applications, and what patterns to use, it's important to realize that enterprise applications are all different and that different problems lead to different ways of doing things. I have a set of alarms that go off when people say, "Always do this". For me much of the challenge (and interest) in design is in knowing about alternatives and judging the trade-offs of using one alternative over another."

Book: "Patterns of Enterprise Application Architecture"
Author: Martin Fowler