There has never been a time when most technology in use was understood by the general population.
"The Last Man Who Knew Everything"[0] was 1773–1829 and the trend towards compulsory education was only beginning, 2 countries at the start of his life and 7 at the end[1].
There is nothing surprising in that, we know where we have been historically.
When people don't understand vaccination, or electricity, or the shape of the Earth, the more interesting question is where we are going.