Switch once per roster rewards to per character

I saw this with chaos line and it seems its going to be the same with throne spire. While I can understand that the rewards are meant to boost one character a bit farther, usually a persons main, it seems such a waste to introduce this new content that will be obsolete in a day. Further more switching throne spire and chaos line to once per character seems like a really easy way to help people bring characters up while not having to add a new event.