I wouldn't be surprised if they removed them. It'd be an easy way to get 310 for whatever particular engram slot for 300+ people.
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Thats where I was going with my suspicion. Iv used exotic engrams to level up to 310, but have had to rely on 3 of coins. and If i recall correctly, 311+ people can get 320 decrypts. So I could see them limiting the paths.