For me, it does result in no shorts on the main recommendations list. They still appear on the recommendations shown while a video is playing (and there they do

For me, it does result in no shorts on the main recommendations list. They still appear on the recommendations shown while a video is playing (and there they don't have the "show fewer" option) but they eventually (maybe 7-10 days or so) reappear on the main list as well. this is all in the iOS YouTube app, which is the only place I watch YouTube.