The short answer: Because we cannot communicate the gospel clearly to others without a clear understanding of systematic theology. Here is the takeaway for me: “We do not just need the individual pearls of truths; we need the string that ties them together. Without the larger picture of God’s unfolding drama of redemption, and without systematic theology, pastors are constantly throwing out pearls to people, but they have no string to put them on and hold them together, and keep them in relation to each other. Because we left out the string, the pearls are jumbled and rolling around, and eventually get mixed up with things of lesser value, and many of them are lost in the confusion of competing worldviews that come from everything to Internet billboards to car commercials.” From Randy Alcorn and Eternal Perspectives Ministries………………………

https://www.epm.org/blog/2021/Jun/30/value-studying-systematic-theology