Free (as in freedom) software developers often write software that serves some purpose for themselves. That is, there are any number of people writing GPL software for...software development and similar things.
Consider the grandparent post again:
> If the last several decades have shown us anything, it's that the free software movement is excellent at creating some kinds of software (operating systems, development tolls, severs) and generally pretty bad at many other kinds of software (games, content creation software, etc).
This seems to suggest that, if the last several decades have shown us anything, free (as in freedom) software developers are more likely to be willing to write software used for software development, and not very likely to write high quality games or content creation software like Photoshop.
It's well known that those in the free software community are often not paid very well, if at all. Consider the problems OpenSSL has had getting funding, despite millions of people all over the world using it every day.
The people who _are_ writing Photoshop are very much in it for the money, and are taking every step they can to ensure a steady income stream. Look at how Adobe is now trying to rent people Photoshop instead of giving them their own copy.