Also, you are being a bit contradicting. It is not"actually impossible" for ironmen to get if everyone has the exact same chance. If that is the way it works an Ironman could grind the league exactly and be the first to complete tasks that are enough to purchase a cosmetic. So how is that"actually impossible" and not"nearly impossible"? If a single ironman can obtain it, then it is not really hopeless and you contradict your own argument against itit RS gold would just be like grinding complete third era.
You refute that by asserting"I can get 3rd era any time from a random clue between today and the death of OSRS. But I'll never be able to acquire a decorative from this shop if I do not take part in a specific tournament." Of course should you hints you've got a prospect of era, but you can not compare to not doing something doing something. It is like if you did not do hints; you're choosing to not do, if you don't take part in the championship. But a choice not to do something does not mean it's"actually impossible".
Anyway, your argument is based on assumption and ones that were incorrect according to what Kieren has said. You old school rs gold have to play with the team to earn the benefits we understand. But there isn't anything to say it will be impossible for Ironmen to earn points to buy the rewards. There's nothing to say that the rewards are"one-time uniques" either; in fact, I doubt they'd be since that would be introducing"rares" back to OSRS, that has been shot down. And after we get the entire blog with the rewards and benefit system clarified, if you do not like it, you could always vote no. But arguing on the assumption you believe you might not be able to receive them is absurd.