Because Dennis Ritchie, having consulted his crystal ball, wanted to annoy you?Thank you for that perfect example. I did (eventually) find the "man" command. The question that needs answering is why the "man" command isn't the "help" command!
On the other hand why should we expect the French to use English expressions for everything? That's like using a well known copy paste shortcut under CP/M and then complain because the machine rebooted! Ok, not likely to happen nowadays but when in Rome etc.In much the same way as the French try to invent new words to stop their people speaking English, so they have ordinateurs and the rest of the world has computers!