Regarding your question: <em>” If you’re quoting someone, almost certainly something that someone wrote, is it advisable to hyphenate that text when they didn’t?”</em>, here’s some insight you could find useful (or not).
Hyphenating is part of having “editorial etiquette” if you will.
The principle of using hyphenation is so that the text being read is legible in the container is being displayed in. Words ‘break’ and that’s part of their nature and hyphens are the physical evidence of that nature.
Hyphenating needs to happen whenever the words require it, regardless if the words are in someone’s quote, or a product description, etc.
So, yes, hyphenating someone’s quote should be editorially correct, but mostly, polite.
Heck, even the author should thank you if you did a good job hyphenating his/her quote :)