They were beginning Em...simple as that. You don't swallow the entire steak in one bite.
By your premise, the "four things" mentioned were all that were EVER required of them.
Nonsense.
Did the 10 commandments fly out the window by those "four things"? Just do these fours things, but murder, adultery, covetnous, etc. are all good now?
Salvation by faith, works always follow.
Your premise is ridiculous...at best.
Moses, every sabbath was preached...they would go and learn.
Simple.