It's just a style issue...like button down collars on shirts, pleated pants, etc.The 1940s-1950s watches were small styles. I have a number of Hamilton vintage watches and they are around 30MM. Look like unisex watches, but the quality is superb. Who knows...small watches might come back, then what would we do?
" lie on the bed with the watch upside down over your head "
And will work even if you are not in bed ...just get the watch upside down over your head>