We use steel lines with double flared ends.
To each their own. I am a plumber by trade my brother is an auto mechanic.
We also use stainless steel tubing which I put on my 1977 Jeep CJ7.
I would worry about dissimilar metals touching.  Classic Broncos .com - Tech: Double Flaring Brake Lines on your 66-77 Early Ford Bronco.
__________________
Tony
"I couldn't repair your brakes, so I made your horn louder."
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