Are there any survival sandbox features you'd like in MMOs?

I’ve been playing a lot of ARK: Survival Evolved lately. It’s certainly not an MMO, just judging by player count, but it has elements of progression, persistence, crafting, and combat that many MMOs share. My question to you this morning, MassivelyOP readers, is whether or not there’s any aspect or feature in particular from ARK or its survival sandbox brethren that you’d like to see incorporated into an honest-to-goodness MMORPG.

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