TTF text as graphics

Why some programs produce TTF text as graphics (filled areas) instead of text? An example - AutoCAD. And I see such a program myself: it uses ‘ExtTextOut’ and ‘DrawText’ Win32 functions to draw text to PDFCreator printer DC, but the output PS and PDF files represent the text as graphics. This obviously makes PDFs less usable (no text editing, copying, searching, etc.).

Dear PDFCreator support,
please answer the question and give me a hint about my two previous ones.