Why is everyone even concerned about getting full Darklight for every class? It's not necessary by far.

All this fear about how it's going to take months and months to get every piece of Darklight in the catalog is a self-inflicted problem. You don't need full Darklight for anything. You don't need full Darklight for every class. You're better served getting a couple pieces of Darklight, then moving on to hardmodes and Binding Coil.