Authorial intent

Schleiermacher saw language as self-expression.

Not unnaturally, on that theory, interpretation of language retraces the path of language back to the source, to the author’s intention.

But Schleiermacher’s view of language is of a piece with his liberal experiential-expressivist theological framework.

Why then would any evangelical, rejecting Schleiermacher’s theology, follow his hermeneutical theory?