I was browsing a Home DIY website and in the electrical section came across something which puzzled me. (I'd post the link, but I've completely lost track of where it was now!)

A guy was asking about wiring a workshop. The reply included advice about whether to use 15 or 20A branches for the regular 120V receptacles. I know that 15A recepts. are allowed on a 20A branch in the U.S., but according to this reply the CEC requires 20A recepts. if the breaker is 20A. Fair enough.

It's the next part I can't figure out, because the response went on to say that it may not be worth wiring 20A branches, because of the need to re-plug all the existing 120V power tools with 20A plugs.

A 20A recept. will accept 15 OR 20A plugs. So why would there be a need to change any plugs? Am I missing something, or is the guy responsible for that reply talking out the back of his hat?