Really, that was the main reason for completing bounties, for me at least. After stucking at level cap you still could've upgrade your abilities by getting xp, but now you patched this after the maintence, at least I assume so, which is truly a bummer! Please, return this feature coz I'm starting to look at my BF4 case.
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It was locked off before the patch. You could get halfway through the Second tier of abilities and then it would cut off. I think you just happened to hit that threshold afterwards.