I found this thread as a result of my notes disappearing from the inventory item editor, after upgrading from Premier 2012 to Premier 2020. It looks like 7 months have passed without the suggested changes being made. If the Notes are no longer going to be made visible in the editor, how about at least adding a flag icon of sorts on or near the New Note button, similar to how the Attach File button appears in the Create Sales Order screen? Then one would at least know whether there are existing note(s) for the item.