Legendary shards are not hard to earn. The amount of glimmer is. I can earn thousands of shards without trying. Glimmer, however, prevents me from doing way more. Increase the cap or give us another option to trade for glimmer. Like shards, prisms, or other things I get more than the cap for.
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If you can earn that many shards then glimmer isn't an issue either, since you can trade 10 shards for 10k glimmer.