Right now I would say that storage is really important, at elast for the moment as the games popularity drops untill there are more stuff to do, finding people who can make new armor gets a bit harder, and repairing your own gear while was always more useful, becomes more and more important as the chances of finding someone in the field that can repair might not always be possible. And as mentioned before fatigue plays a big part in it all.
I had like 20 slots of iron ore of various grades and types *liominte, iron ore, iron sand* and that took me about 5-8 hours to go through and get 1-2 levels of blacksmithing. Same with carpentry, you need alot of supplies to level up, and if your like me and gather your own supplies to cut down on costs, you need to store up alot, so your not just going back and crafting for 30 mins before you have to go back out and get more. Also you run into stuff like with alchemy and fishing, catching bone crayfish, I end up with twice as much crimson crayfish and other 40 alchemy that I'm only just now starting to be able to use with 60% success rate *But fail comes out to the exp of bone so worth it* If you could just hunt for iron ore it be simple, or pine logs and such space wouldn't matter so much, but you get so much extra material that you will need later on or for other crafts at the same time that like I said with the dye material, getting 1 type of moss brings you 6-9 more. Or logging brings you 3-5 more log types and so on.