“It’s hard to be a James Bond in an Abbott and Costello world.”
That’s why it was left to wizards, who knew how to handle it safely. Not doing any magic at all was the chief task of wizards — not “not doing magic” because they couldn’t do magic, but not doing magic when they could do and didn’t. Any ignorant fool can fail to turn someone else into a frog. You have to be clever to refrain from doing it when you knew how easy it was. There were places in the world commemorating those times when wizards hadn’t been quite as clever as that, and on many of them the grass would never grow again.
— Terry Pratchett
“All our knowledge transfer was done in person using heavy sarcasm and obscure hand waving.”