This is something that a lot of the newer parts of the game need, really. Liches are just one of the more obvious examples.
One of the main things that kept me playing early on was how most of the grinding could be done in multiple ways. All the original resources are available on at least two planets, usually with different controlling factions. All the alert rewards came from different randomized missions all over the star chart. Pretty much all mods dropped from at least a couple different enemy types. That sort of thing.
The worst grind at the time was for Warframes, because that