Your first step is wrongThe first step to understanding the problem correctly and easily is to see that Si types are not the SJ's in general, but ISTP ISFP ESTJ ESFJ (thus changing the S/N axis gives the correspondent intuitive group - INTP INFP ENTJ ENFJ). Then you will notice how all of them prefer to relate descriptions of physical(if ISTP or ESTJ) or emotional(if ISFP or ESFJ) phenomena to systems (cause-effect systems) that are "direct" and "immediately observable". Ni types instead relate physical (if INTP or ENTJ) and emotional (if INFP or ENFJ) phenomena to systems that are "symbolic" or "abstract". If it's an example that you need, I will give you one of ENTJ and ESTJ.
First, where an ESTJ strategy is successful and an ENTJ strategy is not:
ESTJ: "My tooth is aching because I have eaten sugary food"
ENTJ: "My tooth is aching because of the conjugate action of a quantity of self-replicating bacteria interacting with each other"
Then, where an ENTJ strategy is successful and an ESTJ is not:
ESTJ: "The stock market went up because they decided to bail out GM"
ENTJ: "The stock market went up because of the systematic expectations of the agents on the behavior of their neighboring agents, which is in line with what was predicted by the diffusion model"