I fully agree, the developers of open source software are wasting the time of their users. Thinking about it aren't the users in an open source model also developers?

Open source software with a sufficient number of users with a clue sooner or later will have sufficient documentation.

There is a lot of open source software with bad documentation but most of the open source projects have no traction. This is different from commercial software where some of the dead software never was released. Comparing statistics between the two is oranges to apples.