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In my experience you just have to go for it with more leverage.
I am not a plumber, but the house I grew up in and the house I own now are both around 100 years old. Some galvanized and some copper.
I always hate having to work on the galvanized... For exactly the reason you're having. "Replace the angle valve or nipple" turns into having to open the wall and replace xxx other pieces. 😕
Again, I have found trying to support the joint closest to what you're removing and then using firm linear pressure with a large pipe wrench works best. I have tried the "shock and awe" with a freeze off product and banging elbow, tee, etc with a hammer, then the pipe wrench.
Best of luck, hope you don't end up following it to the attic...
Also remember that galvanic reaction occurs between the copper and Galv. Use appropriate connector. Usually the flex lines have this built in these days.
Cooper
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