Yeah, the part about gaming the system may not actually apply.
Now, bloated software is still bloated software, even if it's open. I guess that with the sources the community can make it better, but there's still a limit to how well they can do: the hardware interface itself. It's a long tradition in hardware design to ship crappy interfaces and just say the software folks will make it nice. But if all you ship is the hardware, the interfaces have to be nice, else it will be harder to program for, and that definitely influences the ultimate success of the platform. See game consoles, I believe those who have a reputation of being hard to program tend to sell less (because they have fewer or worse games).
Now, bloated software is still bloated software, even if it's open. I guess that with the sources the community can make it better, but there's still a limit to how well they can do: the hardware interface itself. It's a long tradition in hardware design to ship crappy interfaces and just say the software folks will make it nice. But if all you ship is the hardware, the interfaces have to be nice, else it will be harder to program for, and that definitely influences the ultimate success of the platform. See game consoles, I believe those who have a reputation of being hard to program tend to sell less (because they have fewer or worse games).