"as they can just go and look them up when needed, and then forget them again until next time."
Retention of facts is often used as a sign of "intelligence". What is probably more useful is to know the "flavour" of something- and then to be able to find and understand the detailed reference.
The latter used to be difficult to do in the pre-internet days. You had to remember which book probably contained the information. That cut you off from the books you hadn't read on the subject.
Nowadays Google usually provides enough links to be able to select which is most credible - even down to a paragraph in an out-of-print Google Book.
On occasion I still have to find something in a paper book. It reminds me what a time-consuming process it can be - even when your memory has been near enough word perfect.