As a general rule of thumb, I don't ask why God has made certain things necessary. But in my limited human reasoning, I believe that sharing a communal meal with God is a good way of establishing, re-establishing, or maintaining a relationship with him. However, although hving the temple and making sacrifices is the ideal, Judaism functions quite well without it. We simply do what Hosea commanded us to do -- render as bullocks the words of our lips (IOW replace sacrifices with prayers).Why were sacrifices required.
You do not like to think hard about things do you?