I realise that, just seems rather perverse that loyalty is ignored for OBC. I'd rather have lower fare and less OBC when I'm getting loyalty discount, but didn't get that choice (obviously if I'd know price reduction was coming, I would have waited). Just feel that it's a mean thing for them to do, it should be easily fixable to apply discount to OBC spend, and it would keep loyal customers happier (and loyal!).
It annoyed me enough to fire off an email to them when I realised loyalty discount wasn't applied. It is stated in T&Cs but the mypocruises account viewer makes it far from obvious, you have to dig.