Also, to answer the OP, yes, you can skip Eureka altogether, and pretend is doesn't even exist. It comes out too late and requires too much effort that is, often, anti-fun, and all for a weapon that will be outdated as soon as the following patch comes out.

Crafted gear, tome gear, 24man gear when the relevant raid comes out? These are your best bet for staying on top of your gear. Then just learn and farm the newest primal for a decent weapon that will last so much longer than the SB relic stages, and actively require more of your mind than Eureka does (where it instead sucks your brain through your wallet, a la., sub fees and time).