One area of constant concern is storage space, yet we have to pre-make a bunch of things to research traits on alts. (Not everyone but some of us.)
The need to store pre-crafted items to research could be completely removed if we could research anything known by another character on our account, requiring the trait mat and enough of some core resource (whatever can craft one of the item) to research it. It would cost the same in mats, just eliminate the pre-craft need and allow the research to happen as long as the mats were available.
This need does go away, but only after months or more. Some swap between characters to make things as needed, but that take a fair bit of time and also wastes system resources.
PC
PS4/PS5