I do apologize if this has already been pointed out but I would assume that people aren't aware of where they are conceptualizing this idea from. The aspect of having a retainer gather is no different then the concept in SWTOR where you could send out your companion to gather materials for you, but at the same time you could still do it manually.
So what if she used the word "chore" what else would you call it, a job, a duty, a mission, do any of those words really make it seem any more "fun". Would it be fun if she had called is a job lol, because jobs aren't always fun, so then people would be complaining about it being called a job.
But I'll digress on what everyone is nitpicking on by the fact it was called a "chore" what's a chore? A chore is something someone tells you to do, so the context of the word is proper given the situation, you are telling your retainer to gather for you, it's also a chore for the retainer to sell items for you and anything else they do.
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Anyways this idea has potential, if they learn from the mistakes in SWTOR. The issue with SWTOR is they didn't use this concept to it's fullest potential and they squandered a lot that could have been.
One simple example is when you send out your retainer/companion, have a chance that they could find a map to a dungeon/instance where you can find rare unique loot, that's only accessible through the retainer finding them. This would add a wide variety of content to the game if they focus on this feature being something that can open up the door to new areas, to new dungeons, to rare recipes, etc etc.
So honestly you shouldn't be shooting the messenger for the basic example given and even then it might not even be implemented that way. But if you loo at the potential of the idea you'd see that an idea like this where say the mission you send your retainers on are time based. People could setup their retainers to do something when they aren't logged on and have something to look forward to when they get back.