PUAs have drawing selectively from pickup knowledge for years: using what they like, and throwing away what they don't. I see no reason why non-PUAs shouldn't do the same.

Well, I see a reason. After you modify someone else's advice, you ought to test it to see if it still works. If you didn't test your modified version, you shouldn't publish it. What would you think about advice for entrepreneurs that was tweaked and republished by a salaried programmer?