It is important that everyone has access to what they paid for. That's a certainty.
Someone who doesn't care about that would probably say "Oh yeah? Well if everyone who wants to do it already did it, then why do they need it back?"
That's not how I feel.
You are also correct about not needing the power upgrades. My three guardians are all 330+ and I didn't do any prestige activities this week. That said I don't think it was ever meant to be an avenue for power progression, more of a challenge that awaits at the end. It's unfortunate that we've lost that now. Vanilla players would have had to wait a little longer, but I think we could have had it both ways.