As with everything, don't take it as a gospel. It's a tool that can be somewhat beneficial in the right circumstances, and it can also be abused and lead to horrible results if used dogmatically.
Uncle Bob is seriously not a master or guru but instead more of a well-known blogger-turned-author.
(And using "Clean" in the naming of a guideline is an offence that should be punished with... cavities in his teeth.)