[css-display] Confusing list-item note #1470

When I read a sentence like "X can only be an A, a B, a C or a D", I expect A, B, C and D to be pairwise disjoint. However, CSS Display has this note:

a list-item can only be a block box, a block formatting context root box, an inline box, or an inline-block box.

This is confusing because

• Some BFC roots are block boxes, and viceversa.
• All inline-block boxes are BFC roots.

I would simply say

a list-item can only be a block container or an inline box.

Also note the grammar allows run-in list items. Maybe run-in flow and run-in flow-root are already covered by "inline box" and "inline-block" ("block container" in my proposal), respectively, but it's not much clear.