Associated with that notion that teachers don't need to deliver much in the way of factual information, the way in which History has been subsumed into a broader curriculum element called something like Studies of Society and the Environment (SOSE) along with elements of Geography, Economics, Anthropology and Environmental Science (among other disciplines) limits the amount of historical background in most people's primary and secondary schooling.
Which brings us to a second point.
Some observers will dismiss that complaint with an airy It's all out there on the internet, anyway, so that's not a problem.
That seems to be a widely-held assumption, and, to a degree, it is true.
Wikipedia has become a widely used source of information when you need basic information about something or someone. But a Wikipedia article is only as good as the combination of authors who have contributed to it. Many entries contain editorial comments (5) that, in some cases, date back years.
So Wikipedia is definitely useful, but it may not be reliable, and the accuracy of the content will vary across a spectrum from factually incorrect through dubious to reasonable and, possibly, authoritative.
And a single source can't deliver everything the individual needs to know.