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I am an Independent Researcher so am decidedly ambivalent over Plan S, as there is no way I could continually afford the steep processing fees and no one will pay for me. More precisely, I can at present afford to pay article fees, so could not be exempted, until the point I could no longer afford to pay.
Bamji flags up a problem where an article is rejected by a main journal but then accepted by its Open Access version. This could of course be due to lower standards, but there is a simpler explanation. Not all papers with excellent peer reviews can be accepted by Editors. I am preparing a review of a common but unrecognised syndrome which will involve an extensive literature review. A shorter version would no doubt be rejected on the grounds it was too speculative and controversial and I had not addressed all possible objections. The long version would then be rejected on space grounds alone, but I would hope it could be redirected to the OA version where there is far more available space.