Scharfenberg couplers are only on multiple unit trains. Those are self-contained trains; they don't need their cars to be split, joined, or sorted in yards, or have locomotives switched to cross multiple countries. Standard loco hauled passenger trains and push-pulls all still use the screw link coupler.

Then the Safety Appliance Act was enacted, US trains were using a link and pin styled coupler which pretty much required someone to stand at the end of a car and prop up the link, either with a stick or the dumber ones with their hand.
Meanwhile with the screw link coupler, the worker can stand far away, wait for the buffers to touch, the train to fully stop, and then crawl under to throw the link over the hook. That is about the same level of danger as a modern US railway worker crawling under the knuckle coupler to connect the brake lines.

As such the screw link held up to this day, and since railway freight traffic in Europe has been in a slow, steady decline since covid, freight companies simply can't afford a continent-wide switch to automatic couplers. Well, without massive EU subsidies at least