As a professional editor, this is one myth that just won’t die. None of the grammar style guides has ever condemned the use of a preposition at the end of a sentence. This is a remnant of 19th Century classism and gatekeeping meant to prevent poor whites from donning fancy clothing to try to pass themselves off as rich folk. (Obviously, nothing was needed to keep people of color at bay.) This is just one of the few remaining convoluted rules of grammar designed to spot an imposter. Please, let it die.
@mwaurelius If you think News Control or thought shaping started with the Internet, you’re very young or poorly informed. Go back and watch some “nightly news” broadcasts from the 1960s and 1970s. In retrospect, and armed with the facts of the day, we were horribly misled.
Modern humans didn’t kill off Neanderthals; they bred them out of existence, much like the Picts of Scotland.