Just a couple of points:
1. PANS OPS is an ICAO manual, and offers guidelines for instrument procedure design. It does not have the same status as a Standard & Recommended Practice. Individual States may specify different criteria (e.g. the New Zealand AIP states that the 25nm MSA is for emergency purposes)
2. The 25nm MSA does not guarantee navigation aid reception.
3. FAA TERPS criteria specify that the 25nm MSA is for emergency purposes.
OK, that's three....