I think of PhotoReading more as a "1st half, 2nd half" process. Prepare/Preview/PhotoRead as the 1st half, and Activate/Rapid Read as the 2nd half.
I've used PhotoReading since 1992, and the 1st half of PhotoReading always gives me an intuitive "red light or green light" as to whether I needed to activate it or not.
I've noticed when I've only done the 1st half, there seemed to be only a limited amount of information that spontaneously activated without doing the techniques in step 4.
By far, the best way to "hard wire" your brain for making the PhotoReading techniques second-nature, is by committing to Preparing/Previewing/PhotoReading 5-10 books a week for one full month, and each week go back and fully Activate/Rapid Read a couple of those books each week. And, it increases the number of new neuropathways between your conscious mind and your memory bank. Which, improves your chances for spontaneous activation.
Hope this helps.