The art of keeping the Torah is hard to learn. And it is an art form. And like most art forms you need a passion for it. And it is hard to define exactly what it is. But you need to learn it from someone who is good at it. And this  hard to find.

 
  But religious people in general are strict about ritual mitzvas.   Most people have difficulty in concentrating on more than a small set of rules. And the religious spend a tremendous amount of time and attention on mitzvas that are between man and God.. After all that effort it is hard to be asked to spend the same amount of human interactions also.
My suggestion is that both parts of the Torah should be emphasized, the part between man and God and the part between man and man. And it is this balance that I think brings to human perfection