Apparently this was a bug that was fixed with the most recent patch. I thought it was on purpose given that this exotic has been pretty heavily power crept by so many new exotics. I feel like sacrificing your exotic slot as well as perks and/or fragments in order to build into AE is balanced enough. I didn't run into a single person using this, and I didn't see a single person complaining about it.
I would like the ability to ADS while flying with Lion Rampant to be reinstated because it was really fun and I liked it a lot.
Thanks!
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This amounts to a totally unnecessary nerf to an already underused exotic. Once again, Bungie "fixing" things that aren't broke while ignoring things that are.