I can understand it's hard to retrain, but in the end you don't want to support an obsolete standard just because you're used to it.
Obsolete by how exactly?
"Or are you just afraid of the change?" was something what my colleague asked me when I complained about the Ribbon (and that you can't configure it!) and Microsoft breaking some of the other compatibility things. I had to remind him that I could as easily break his elbow and after seeing his protests I asked if he was "just afraid of change" to get the point across.
The thing is, CAD program interfaces should not change quickly. Trust me on this, it is not only asking, but begging for trouble. The same stuff applies for other engineering programs. Seeing that the uptake on Ribbon on that field is around 10 % or less; well that gives you an idea how intuitive it is. Optical Design software houses have already promised they aren't going to try in any time soon.
I guess in the end it all goes down to whether the user wants a modeless UI or not. Ribbon goes for the modal UI, while menus are modeless and all options are accessible at the same time. Former research said - I read about this on internet and I don't care enough to find the reference, I'm simply not interested enough - that modeless UI is better. Due to the amount of clutter in nowadays Offices it seems that Microsoft has reconsidered their position.
My question is that why did they replace the text with icons that just take space? Graphical icons are a lot slower to interpret, while the meaning of a text is immediately evident. I'm yet to see a icon that could describe e.g. modulation transfer function as well as a button with a text "MTF" does.