Don’t disagree with you that a (very) small number of people would be affected by a hard expiry (but again, easy to extend by at least a year), but 15% of the calculation? I would suggest 1%.
Apart from AFF I follow groups on Facebook, Ozbargain etc. By far the largest complaints are about availability (Qantas in particular- so I thought the Average rating for them was generous!), it would be untrue to say SQ expiry is never mentioned but super rare and I’d suggest a small minority even on this site.