Probably a bit late, maybe even others have already talked about it but as Raid banners are mainly obtained through Hawthorne for 4000 glimmer a piece or 10 for 40000, it kinda makes getting them more annoying than it needs to be. Not hard, just a chore as glimmer is used for everything. They probably could have been exchanged for legendary marks too at one of the tenet things. Maybe 10 for 5 or 10 legendary marks, would make getting enough to never care about the chore of obtaining them ever again. Again, not really a huge issue, but I just think it would have been a good QOL addition if they were.
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Glimmer is easy to obtain, seems this is a you problem.
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Hawthorne gives 10 or something per rank up. I think I'm around 110 with her. Xur sells them as a chance for 1 coin.
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They have been purchasable with Legendary Shards before they removed them at some point, bought about 1k and haven't been looking since. Sound like a good idea, but I'm afraid that's not going to happen.