Hmm, I guess I'm making the assumption that most modern cars with no major damage (cc failure, paint chipping off, etc) that have never been polished can take at a minimum of a few coats of SSR3 no problem.
I'm also making the assumption (maybe prematurely) that I'm getting fairly proficient at deciding how bad swirls/scratches are to be able to decide to go to SSR3 right away.
I do understand most people push for "use the least aggressive first" method.
I just hate wasting time with say, SSR2 for example on a panel and after 15 min finding I need SSR3.