It is intentional, since these elements aren't specifically made for usage in levels themselves, it's even told in their descriptions.
As their names say, they're referring to specific groups of elements or CE change page.
Here's an example: Create a custom element with these CE change settings.
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After that, put it in the level, give it some open space, and in that space, place some random moving elements around it to let them move around and occasionally touch it. On playtesting you will see that it will start turning into the elements that it gets touched by.
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'Touching -> REF Any element' means it can be triggered by any element (except player), and all it does is change it's look into whatever just touched it [Change CE Artwork -> Trigger], considering it was given a very wide range of elements to react to. Although this kind of use is pretty pointless, put one of the simplest to explain.
If you don't wanna make one, here's a simple example for you to check: