I too have had the rough end of the stick on Netracell runs since the drop table changes, with 7 adapters, 2 legendary arcanes and 1 shard.
Hopefully i don't see any more adapters for a while and get better shard luck, but I also agree that limited run game modes shouldn't contain items that are available to purchase from vendors.
Netracells should be shards and legendary arcanes only IMO.