Comment # 4 on bug 905351 from Nathan Cutler

No, that's not accurate. Nouveau is the open-source driver for NVIDIA, not for
Intel. For Bumblebee to work, you need *both* drivers. But the end user doesn't
need to worry about this, because they are installed/activated automatically.
Therefore, I think the earlier version (before your edits) was sufficient.

Also, your edits don't make it clear that the open source driver option is
basically useless for anyone who wants to actually use the discrete graphics
adapter, which is the majority.

Typically if someone is trying to install Bumblebee it's because they want to
get the most out of their discrete Nvidia graphics card, which means using the
proprietary driver.