Definitely, but it depends on how you use those summaries. A breakdown is often a bullet-point list or a chapter-by-chapter recap, which is great for reminding yourself of plot details if you've already read the book, but can be a risky tool for making a 'worth it' decision beforehand. The main danger is spoilers stripping away the narrative tension—knowing exactly how a mystery unravels or a relationship resolves can drain the life from the actual reading experience. I find that reading a dry plot summary of a novel like 'Project Hail Mary' would completely ruin the joy of discovering the story's central puzzles alongside the protagonist. The summary might tell you it's about an astronaut saving humanity, but it can't convey the witty, desperate, and hilarious tone of the prose that makes the book so beloved.
Instead, I treat breakdown summaries as a final checkpoint after I've already gathered other impressions. I'll first read the publisher's blurb, skim a few non-spoiler reviews to gauge the writing style and pacing, and maybe listen to a sample of the audiobook. If I'm still on the fence, I might glance at the first few points of a summary to see if the initial plot setup hooks me, but I stop before any major twists. This method helps me avoid stories with premises that fundamentally don't interest me, while preserving the surprise. For instance, with a dense fantasy novel, a summary might reveal a overly convoluted political plot I'm not in the mood for, saving me a lengthy commitment. Ultimately, the summary is a blunt instrument; the finer tools for deciding are in the book's voice, characters, and the emotional journey, which you can only sample by reading a few pages yourself.