Indeed…? Lacking a bit of context though and using a pinch of hyperbole. Lets break this down.
76 Residuum for a 14 key. 675 for a 385 piece
You are kinda leaving out a lot of details. 675 for a SPECIFIC 385 piece, you can get a random 385 (slot specific) for 165 Residue. So your statement of–
Is inaccurate in a broad sense, and for multiple reasons.
First, you are spinning this situation as if any 385 piece is crazy expensive and will take around 9 weeks to acquire even though its only specific pieces that cost a premium and Blizzard had stated that well in advance.
Second, you word this post as if the ONLY source of residue is from caches and that wont be collecting any from disenchanting/salvaging. That could honestly be seen as the absolute bare minimum effort. If you are putting forth the bare minimum effort then of course its going to take longer.
Getting a random, but targeted by slot, 385 piece is only 165 residue. If you are aiming for a very specific piece then of course its going to take more time to earn. Getting just a 385 however is going to be a pretty quick process.
While I do not know exactly how much residue you get fir DEing or Salvaging (seeing a lot of people mentioning that 340’s are 1 and 370’s are 12), I bet its entirely possible for someone who puts in the effort to almost get one piece a week and a specific piece every ~4-5 weeks. Remembering that specific pieces are a premium for convenience.
You wish the new forums gave you an easier way to be a defamatory troll?
EDIT: So, I found the chart of how much you get from pieces. I would like to fix my earlier statement of possibly being able to get 1 piece at 165 a week and say that its less likely than I thought now that I see the actual numbers. Still, its entirely possible for the average player to get one every 2 weeks and a specific piece every 5-6.
Here is the Residue Chart from Disenchanting/Salvaging for everyone who wants to see it.