I just thought of something. People haven't really done the lvl 30 raid yet but I believe it gives you different raid gear. Does this mean the lvl 30 dropped gear may have more light? It's completely possible and would explain why it still shows progress to 31 when someone hits 30 instead of just saying Max Level.
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No 30 is the max, there are just 2 sets of raid gear, look at my hunters chest, that's the chest you get from doing it on hard if your lucky but I got it from easy