Why is a just a rather odd wh -word. Its distribution is very limited -- it can only have the word reason as its antecedent, and since it's never the subject it's always deletable. Consequently it behaves strangely, as you and others point out.

Understanding the Context

9 1) Please tell me why is it like that. [grammatically incorrect unless the punctuation is changed. Please tell me: Why is it like that? The question: "Why is [etc.]" is a question form in English: Why is the sky blue?

Key Insights

Why is it that children require so much attention? Why is it [or some thing] like that? The question is: why did the English adapt the name pineapple from Spanish (which originally meant pinecone in English) while most European countries eventually adapted the name ananas, which came from the Tupi word nanas (also meaning pineapple). Why should, asks what you think are aspects or POTENTIAL aspects of the career that would cause a young professional to desire it. If this was a conversation as to how to increase the number of people in the field the answer could include aspects that do not currently exist.

Final Thoughts

While the aspect could exist in potential, it would have to be real. Why have a letter in a word when it’s silent in pronunciation, like the b in debt? Can anyone please clarify my uncertainty here? The history told me nothing why an involuntary, extremely painful spasm, is named after a horse called Charley. Charley in the UK is often spelled Charlie, a diminutive of Charles, and it's also used to call a foolish or silly person. Who was Charley; was it the name of a horse?

etymology - Why is muscle cramp called a “charley horse”? - English ...