Reading a book, or a newspaper or magazine article that’s not chock full of usage, grammar, and punctuation errors is commonplace, nowadays, so I know I should not be surprised, nevertheless (and I cannot count the number of times I have seen that rendered “never the less” in recent years) I am still amazed daily by the subliteracy of published writers, especially those who are published by established media outlets and traditional publishing houses. Of course, that sublterate screeds are actually published warts and all also says any editors who had responsibility for the text are also subliterate.
As are, quite often, their readers.