It's a terrible idea. If I get on an hour before weekly reset and realize I haven't hit my weekly mark cap yet, I could go turn in some of the ridiculous number of materials I have. But now I can't, and I have way too many materials, since I don't have the need to upgrade anything other than exotics at this point.
Relic Iron is the second fastest to farm, doing the chest run in the Scablands on Mars. Relic Iron farming averages 50-80 in one hour depending on how quickly you make it from chest to chest and how lucky you get with chest spawns.
But anyway, I'm going to wait a while and see if there's a safe way to unlock the extra content on the disc before buying any expansions.
After everything they scrapped and dumbed down just to get that T rating, then locking content that's on the disc, and locking people out of the Weekly Heroic if they don't have the DLC? Activision can suck it.