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That fuel can take many forms, of course, but a steady paycheck (and all the qualities of life it enables) remains one of the most reliable forms of fuel yet devised. It's not a bad way of providing focus, either. In a functional commercial organization, you have very specific vision and directives for everyone to follow and the fact that developers don't need to go elsewhere to find ways of paying their mortgage means they can devote themselves exclusively to the task(s) at hand. Contrast this with the general directive to "do whatever floats your boat" in the open source world (modulo whatever organizational goals the thought-leaders may be trying to set) and the fact that, with regrettably few exceptions, its developers still need to put 40+ hours a week into making money some other way. The fact that innovation still occurs in spite of this is highly admirable, but it's definitely like rolling a marble uphill by comparison.
Another point that Jaron failed to make is that the open source world resists change, largely due to the sheer number of opinions on which direction to go in or what constitutes a good or bad idea. In order to topple an existing paradigm, you need to conform to the 10X rule and that's hard. In a closed system, all that it takes to effect change is for one person in a position of authority to say "do it!" and, within reason, it will be done. Even Linus Torvalds saying "do it!" doesn't mean it will get done in the Linux world unless he does it himself, and there's only so much one person can do. Contrast this with the commercial world, where you can have hundreds (if not thousands) of people working in concert on a single goal. Whether the goal is the "wrong" or "right" goal is academic (and largely in the eye of the beholder) - you get on board or you look for another job. Should it subsequently transpire that your goals were wrong, well, all you've wasted is some time and money. If they were right, however, then you've just created something innovative which will have a significant impact on the world at large.
The open source community spends a lot of time arguing itself to a standstill, by comparison, and that's hardly conducive to innovation, which is perhaps the point that Jaron should have made.