[mfuzzey]

You are quite right that open source done purely in free time usually takes much longer to be "finished" but that is more a question of the time available to spend on it than absence of pressure.

OSS projects that have paid developers often manage to avoid much of the pressure that occurs in closed source.

Some OSS projects like the kernel manage to harness companies as way of funding full time developers without giving them too much say in details or deadlines. A feature ships in Linux when it is ready and accepted by the maintainers and Linus not when some manager says it has to ship.

Of course this works far better for large projects that are essentially a "commons" like the kernel, less so for open source projects where most of the developers work for a single company.