Ship manufacturer and manufacture date
Quoting myself from said thread:
Unique (unpackaged) items cannot be sold on the market. Adding this data makes every ship hull unique and means they would not be repackageable. Thus, no ships can be sold on the market (only via contract or trade). That would suck.
(There was a more eloquent and long-winded version of this, but I decided short and to the point would do.)
If you want more details on why this doesn’t work with the current asset system, I’m happy to expand on it. If the asset system is ever overhauled in such a way that this would be feasible, it might he worth discussing, but with the system as-is and no announced plans to overhaul, any discussion is entirely theoretical around the pros and cons of additional visible intelligence about supply lines.