PSD to HTML question.

Why do people design text in Photoshop, but when the convert to HTML they use CSS for fonts?
I'm doing this tutorial http://webdesign.tutsplus.com/tutor…sign-a-professional-blog-layout-in-photoshop/
and alot of it is designing text in Photoshop. This text won't be used as the fonts will be managed by CSS. Wouldn't it make sense just to design the backgrounds in Photoshop? Can any web designers tell me?
PSD to HTML question.

See original post by Oveltonx