Yes, it’s “profitable” for those purposes. Agreed. Nowhere does it say “Use ONLY Scripture.”
And I don’t “hate reproof.” You haven’t given any “reproof,” and you cannot give any reproof, because nowhere does Scripture say, “Use only Scripture.” In contrast, I can easily give reproof to debunk that false notion:
“We also constantly give thanks to God for this, that when you received the word of God that you heard from us, you accepted it not as a human word but as what it really is, God’s word, which is also at work in you believers,” 1 Thes. 2:13.
“Therefore brethren, stand fast; and hold the traditions which you have learned, whether by word or by our epistle,” 2 Thes. 2:15.