Why won't Photoshop PDF's read well on iPads?

At first, I thought it was specifically Safari on iPad that would not display vector data (such as text) from PDF's created with Photoshop CS6.

Then I installed Chrome on my iPad and got the same problem. Displays all the pixel data, but none of the vector (text).

Is this a known issue?

I am referring to PDF's created via Photoshop CS6's "Save As" at regular unmodified/default settings. The iPad is the most recent iPad 4. The Safari and Chrome versions are the latest as well.