Weird /scoreboard thingy

The /scoreboard command has some weird stuff.

If you type /scoreboard objectives add [whatever] minecraft.broken:

you can see a list of things, including things that technically cannot be broken, like non-placeable items (armadillo scute, armor trims, etc.)

This either points to a future addition (placeable items, but I doubt it because it has been this way for a very long time) or is just a logical oversight.