The Confession begins with these lines:
Agreed upon by the Assembly of Divines (Theologians) at Westminster, with the assistance of commissioners from the Church of Scotland, as a part of the Covenanted Uniformity in Religion betwixt the churches of Christ in the kingdoms of Scotland, England, and Ireland.
From this alone we see the nature of uniformity and unity that the Standards were aiming for. The purpose is for the unity of the Christian church. These are the doctrines that all should be able to agree upon. Believe it or not, the more divisive and "unimportant" doctrines were not a part of the Standards. This is Christian unity. Amongst Presbyterians. Amongst Christians.
As far as I am able to judge, the Christian world, since the dayes of the Apostles, had never a synod of more excellent divines than this. -Richard Baxter
The Westminster Standards are the richest and most precise and best guarded statement ever penned of all that enters into evangelical religion, and of all that must be safeguarded if evangelical religion is to persist in the world. -Benjamin B Warfield