That won't do. Imposing a cost on others that we have escaped is basically climbing the ladder and pulling part of it up behind us. Starting a career or advanced education earlier has compounding advantages over a lifetime.
"Opportunity cost" by definition means something was bought. It doesn't mean it was a wise purchase. Noting that something was paid for just affirms the definition.
Low value make-work (underemployment, misemployment) - even during periods of low unemployment - is a hindrance, not an advantage.
Canada doesn't have the luxury of pissing government revenue away on sub-optimal centrally-planned underemployment schemes that delay people from getting on with their lives. No amount of candy-stripers is going to help people facing delayed treatments for cancer.