Rippetoe just focuses on two lifts: bench and squat. They get repeated the most. Actually, it's mostly just Squats.
In principle, I do not like cookie cutters like 5x5 or SS or SL or whatever... They ignore injury prevention stuff, hip mobility, etc. Plus, I prefer Front Squats over Back Squats and Deadlifts over Squats in general so it's personal prejudice as well.
I also like more balanced training where there is enough attention given to Posterior Chain training. Just Power Cleans aren't enough and I for one, don't even like Power Cleans.
Even pure beginner strength trainees can and should devote themselves to lifts they are passionate for and would like to see themselves doing for many years to come. Itís okay to start with something and then shift over. There is nothing set in stone here. If someone wants to become a strength specialist, the ground reality is that he or she will most likely not be stronger than the professional but anybody can be a strength specialist and find pleasure and satisfaction in doing something they are passionate about.
In Part 4 of Eric's Training to Fail series, he's written about Optimal Training