"...standard avenue to discovery..."  This implies that Microsoft intends that operating system users shall learn Windows through accident of discovery.  And it is true that the one avenue of learning that is open to everyone is, in fact, discovering how things work by stumbling over them.  Just as a child might discover which creatures live in a woods and how they behave, a user "discovers," for example, how to launch a program, by fiddling around until a program accidentally starts up.   Genius!  What a time and cost savings for the software originators.