another thing to the "list of the things AD does for DCC apps that are not Softimage"
you mean for only two of their DCCs, because Autodesk has dozens of them.
Point well taken, but I think you need more insight about how stuff happens. It's about what individuals decide to do, not the corporation.
There are dozens of technical product managers, product designers (+reps of all kinds) for Max/Maya. A manager for Max or Maya will go ahead with something like this, and then his Maya or Max equivalent may sometime say, hey, let's do that too. Softimage only had one person filling both roles, and I already wrote elsewhere that he wasn't interested in UserVoice at Avid. We did one Linux survey once I think. I also asked around why Softimage wasn't an option on the public form to submit a bug, and I was told by the Softimage person who could have added it... that he chose not to, because he thought the feedback would be of low quality compared to what comes through beta, support and the public list. It's a entire new team now, I don't know what they have planned.