There is so much to read and not enough time to sift through it all and find out what has been mentioned or not. I will apologize in advance for stating something that has already mentioned, sorry ! I feel like there should be some starting gear and if there is not, maybe the tutorial can walk you though getting your initial gear created. Anyways! The gear I was primarily thinking of is a backpack system. Where, the backpack is your universal "tool" that you use for storing your items, and the backpack limits you on what tools you can carry with you. All of your regular materials can be carried, but say you want to carry a lance around with you. The backpack needs to be fitted with a weapon "module" first, and then you can select what weapon you would like to carry with it. Of course later down the road as you get better materials, you can upgrade the backpack to have more "module slots" that can be fitted with additional modules such as: a mining module that allows larger mineral stacks, a hybrid weapon module (allowing two weapons such as a lance and a slingbow) which would require more advanced technologies and resources to make that module, etc.. I am not sure how people would feel about such a system and I am not sure how hard it would be to implement, but just an idea
As far as wrist and ankle wear should go, there is not really much to do with that in my opinion. Crystals installed on the wrist and ankles is a good idea but there is only so much you can do with that before there should just be a dedicated tool or different gear to do what you would like. Armor, yes. Anything beyond that and you are looking at a more difficult implementation.