It’s a pity when surface problems scuttle otherwise strong scholarship. As an academic editor, I’ve noticed that poorly handled quotations are particularly damning. Inelegant use of prior scholarship can give the impression that a writer is unsophisticated, or even amateur.
Naturally, research does involve mining books and articles to inform our own arguments, which are ideally novel and substantial but still reference that prior work. Often there may be temptation to repurpose existing literature that seems to say exactly what needs to be said in order to get to ideas that are original. It can certainly be difficult to think around the particular ways in which influential scholars have formulated cornerstone concepts.