On the other side, a really good developer has the knowledge and experience to frame the problem in an understandable business context when communicating the issue and options to management. Some of the best work experiences I've ever had were in orgs with such experienced developers and managers. Working together we were often able to solve apparently intractable problems with creative options which would never have been conceived absent the clarity of thought and communication on both sides.
I feel like the "20% time" paradigm where one day out of the week is left up to the developer to schedule (within reason) is the right way to balance the conflicts of interest and still leave room for people to be curious.
Maybe a long load time just wasn't that important for the success of GTA.