At what point?

[guineapig]

Also be careful what you ask cause you might open a can of worms you didn't intend to.
There are somethings that are stackable now that shouldn't be:

The Ruins of Kunark (March 2000)

July 29, 2000
Many new recipes for the "Make Poison" skill are now in game. Features include: Several new poison books, stackable components, new suspensions, some purchasable components, and players now have the ability to purchase vials. Please check your vendors.

The Scars of Velious (December 2000)

July 10, 2001
Spiderling and Spider Silks are now stackable.
Spider Legs are now stackable.
All Sheets of metal and Folded Sheets of metal are now stackable.

July 24th, 2001
Many pelts have been made stackable. Those that are not stackable now are quest items that will not be made stackable

The Shadows of Luclin (December 2001)

April 24, 2002
Crystalline Silk Threads are now stackable.

August 14, 2002
Plains Pebbles are now stackable.

The Planes of Power (October 2002)

There is a lot of other trade skill stuff I didn't bother to copy that doesn't become stackable till 2002, but those items aren't in the game yet