Iron banner does feel more special due to the infrequency in which it is around, overall the changes made have been great to see. However, it is easy to miss one week for many players due to various life commitments, making the final week all or nothing.
Having another week post story content during slower weeks, would benefit players who might not have disposable time, without interrupting Trials weekends too much.
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Or make the weekend of IB double XP. That would help.