Who mandates them? Flying schools? If you're exercising the privileges of your PIFR, you are flying privately, and not bound by anyones Ops Manual except your own personal SOPs. I'm the first to agree that the more recent you are, the safer you are, but the only "place" able to mandate recency requirements is the regulator.
I know of two organisations at Camden that require compliance with CAO 40.2.1 recency requirements before they will allow you to fly IFR in their aircraft.