I'm not sure I agree, but I'm glad it helped you on this occasion.

The real pain the backside with writing a synopsis for literary agents (different to what you're doing here, I admit) is forcing yourself - for once - to tell rather than show. It goes against my every instinct as a writer, and all because literary agents want to see where your story is going, at a glance (including twist endings, etc). I don't understand why they can't just read the opening chapter then request the rest of the novel if it interests them. If the sample chapters are badly written, the synopsis becomes irrelevant in any case.

I spent over a week honing the synopsis on a novel of mine (Spectre of Springwell Forest) which was eventually traditionally published (with a small independent publisher) because of this madness. In this case, the effort was worth it, but I hate doing it (I'm currently doing it again, with another novel I've just submitted, still chasing the bigger publishers).