Hard disagree, the shift in perspective from third-person to the first-person quote is jarring. You use the brackets to mold the quote into the grammatical context of the sentence that surrounds. Extra emphasis on the context of the grammar , as changing the overall context alters its message. You can also use those brackets to cut out unnecessary/irrelevant/extraneous words. A necessity, sometimes, and one that is e…
I'm sorry, but you are simply wrong. Quotes are, well, quotes , and if their grammar absolutely needs to be edited to fit your prose, then that means you shouldn't be using that quote. Editing a quote should be done with grave solemnity -- you are changing someone else's words -- and only to clarify meaning that was disturbed when you extracted the quote from its natural context. Anything else can be handled in your…
I agree that in fiction or other forms of prose, that the writer should try and mold the surrounding context to fit the quote. But when I did journalism I didn't always have a lot of time to do so. If you're using quotes heavily, from a variety of sources, not all of them are going to fit -- you can either spend a long time rewriting your text until you get it right, or you can do some selective editing and preserve the flow without having to refactor your entire piece.
That said I don't have a hard rule about switching perspective. If you can make it work without bracketing quotes, great! But it's one of those things you have to handle with care, and isn't always practical. Hence, brackets.