Which is correct?

The usefulness of learning is considered valuable.

OR

The learning usefulness is considered valuable.

#1 is better, but it's kind of useless.

Of course usefulness is valuable, or it would not be useful.

I can think of a context where #2 is syntactically correct, but it's kind of weird.

Why not just write, "Learning is valuable." ???

Both sentences are grammatically correct, but they have slightly different structures and slightly different meanings.

"The usefulness of learning is considered valuable" is the more commonly used phrasing. In this sentence, "the usefulness of learning" is a noun phrase that acts as the subject of the sentence. It means that the value or benefit of learning is being considered as valuable.

"The learning usefulness is considered valuable" is also grammatically correct, but it is less common. In this sentence, "the learning usefulness" is a noun phrase that acts as the subject of the sentence. It specifically refers to the usefulness of learning, emphasizing that aspect.

So, the choice between the two sentences depends on the emphasis or nuance you want to convey. The first sentence places more emphasis on the overall value of learning, while the second sentence places more emphasis on the specific aspect of usefulness.