For likely the same reason a cleaning service doesn't offer to show the customer what chemical mixture to use to clean an especially grimy tub or oven. The customer is paying for the convenience, not a tutorial, and the cleaners aren't in the "teach a man/woman to fish" business.
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Why not cut to the chase and show the client how to use FTP and a text editor? Why add more complexity beyond that?
For likely the same reason a cleaning service doesn't offer to show the customer what chemical mixture to use to clean an especially grimy tub or oven. The customer is paying for the convenience, not a tutorial, and the cleaners aren't in the "teach a man/woman to fish" business.
Because sometime clients; especially extremely non-technical one, are scared of anything that looks like code. HTML definitely looks like code. :)