Apologies if this has been discussed. The search function on mobile isn't helpful today. In the 10/27 TWAB, it mentioned: [quote]To an experienced player, Deepsight weapons commonly end up in the vault simply for future currency, bringing more stress to inventory management[/quote] However it doesn't talk about Harmonic alloy. I have a ton of raid weapons in my vault for the sole purpose of replenishing Harmonic alloy when I'm below the limit of 50. I'm sure there was a good reason for putting a limit on how many you can have. However if that reason is non-technical, players will just hoard these weapons for future currency, just as is done with deepsight resonance. And it's another layer of vault and inventory stress.