I worked there during this time, and this pretty much confirms what everyone feared when the merger was announced. Part of me wants to read this book, but I know it will make me really mad.
Just a little anecdote, we had a meeting shortly after where Frank Pierce told us that major changes would basically happen over Morhaime’s dead body. So when he left (and Pierce also) it was clear that it was over.
Back in the day TCL was used in a few places in Pixar’s Renderman renderer (called PRMan), and in its connection to Maya. You could write little TCL scripts within the Renderman Artist Tools (RAT) that would be evaluated during scene export. I think this still exists in some form inside Tractor, which is their renderfarm management software.
It’s been a long time since I used prman but generally Python has replaced everything as the “glue” language, which honestly makes things a lot easier. VFX and game dev used to have a hundred different scripting languages rolling around.