Will never happen. Inventory Insight only has knowledge of your alt's gear because it's saved to that addon when you log out of that character. The game has no way to link to another character's inventory. Also, I've NEVER seen the ability to grab items from another character while it's offline in any MMO I've played.
Is that more of a strain on the system than logging in and out multiple times? And if they are not using Inventory Insight that's more logging in and out just to look for items.
You can bank surveys you get from low skill alts and have an have master crafter harvest.I think it would open the game to exploits to allow that to happen. Kind of like the Item Duplication Glitch we had at launch.
Reason, now, when we log into a character, we are loading that character, when we log out the file is closed and another one opened for the other character. To be able to do what you are suggesting, we would have to be able load both/all characters at once. That is where exploits could happen.
How these exploits could happen I am not sure. As an example, back when they made a change with Surveys around the time they released the Assistants, there was a way for someone to trigger a Survey Location, put the survey back in the bank through the assistant, harvest the survey, then pull out the survey out and trigger the survey again. So, 100's of surveys from one survey.
So, it seems like a good idea, and I am sure people would want it (I know I would), its probably too risky for ZOS to implement.
You can bank surveys you get from low skill alts and have an have master crafter harvest.
Has always done that, started because master crafter knew all the wayscrines.