What is the logic behind "Print to save pdf" workflow?

When you print any document in OS X, you can "print" the document as a PDF by accessing a PDF menu at the bottom-left of the print panel, where you can open the PDF in Preview, save it as a PDF or embed it in an e-mail as in the example below:

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I am just curious !

1- Why are pdf conversion options always embedded in print dialog?

2- I understand that having PDF options within print dialog is something that we are accustomed to but Is this not taking the meaning of "print" too far?

3- shouldn't converting/saving as PDF and regular printing be two separate workflows?

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