the problem with any form of research is there is a risk of unintentional plagiarism. You read 100s of articles, books etc. have discussions, and formulate opinions, and then write your own work up, and some of what you say is obviously influenced by what you have studied - that is the whole point really. With AI tools now, it is probably easier to determine when somebody's work might have been influenced by anothers, and without reference.
If the same level of scrutiny was applied to every research paper ever written, similar patterns would probably emerge.