They need to create bags for our materials. Enchanting bags, provisioning etc. That would really get rid of a lot of the clutter honestly and it's a simple fix.

That won't work so well, the major problem is the shared bank. There is enough space for a single character doing all professions, it gets real bad when you have multiple characters at different skill levels trying to level simultaneously. If you add bags for mats, then you wouldn't need such a large bank since the bags won't be accessible to the other characters, if you are shrinking the bank, you might as well have part not being shared. Really at that point, why have a shared bank? They did the shared bank on purpose, I assume to reduce having to mail items from character to character. I suspect part of this inventory management is a nod back to the original genre where bag maintenance was a must.

So yes, the bags would 'fix' the problem you perceive, but doing so would break what they are trying to do, inventory management, meanwhile curtailing what the shared bank was intended for causing the point of the bank to be mute, at which point you might as well just make the bank not shared in the first place.

I got , 1 char i play , 7 chars too keep extra stuff.