4 ideas to make resources feel more valuable and also reduce ecological griefing

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This slows down a single player, but doesn't really prevent overexploitation by the masses.

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Capacity is already limited by quantity.
https://ashesofcreation.wiki/Inventory

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We already have mules.
https://ashesofcreation.wiki/Mules

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As you said yourself, devs have already mentioned these kinds of things. And world events could definitely be linked to overexploitation of resources.

In other words, pretty much everything that you suggested is either already in the game or doesn't quite address potential issues with the system.

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Yep, that's my expectation for them as well. Otherwise they wouldn't make any sense. Which is why I think that your suggestion has been already addressed, cause I believe that Intrepid are smart enough to not make a system that makes another one of their systems almost completely redundant.

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Have you gone through the whole discussion in the Goalid's thread? Cause, while Steven did address the low lvl gathering a bit on stream, I don't think his explanation completely ruled out the potential "abuse" of the system by a guild or a node. Especially if only one character on your account can be a citizen (that is, citizenship is not account-wide).