It’s not.
But the indwelling is not a constant conscious communication, which is what seemed to be at issue.
Men are called to read the Scriptures, and if they've been given eyes to see and ears to hear and a new heart with which to believe in Jesus Christ, all as gifts of free, unmerited grace from God alone, they will understand God's word and His will for their lives.
A behemoth, authoritarian magisterium far across mountains and oceans is not required for a man to know what God wants for him.
All that is required is the guidance of the indwelling Holy Spirit which is a gift from God.
Nothing "private" about it. But very "personal."
And Christ's church on earth is made up of like-minded "personal" believers who come together to worship God and to preach the Gospel of Jesus Christ.