It's not tabbed toolbars which are the problem. I've used them before. TINA had over one a decade before MS Office. As with many things with Microsoft, it's the implementation which is uniquely bad.
A ribbon is much more than a tabbed toolbar - it was genuinely innovative.
How? Sorry, that sounds like marketing. I don't see how there's anything uniquely innovative about the MS Ribbon user interface.
As you will have gathered, I love the cut and thrust of a vigorous debate. However, this is one I don't want to pursue. Firstly, we went through it all several months ago in another thread, so a lot would just be repeating the same old stuff.
Secondly - and I mean no discourtesy - I don't believe you are approaching this with a truly open mind. I think that no matter what arguments and evidence I present to you, you've already made up your mind about the ribbon and won't change it. So on this occasion I'm not going to invest any effort into it.
If, one day, you feel like knowing more about the ribbon - why it was needed and how it was developed - I think the best place to start would be this talk by Jensen Harris.
(It's the first of a series.)
In particular you might be interested to learn that, before the ribbon, the majority of new feature requests from users were for features that already existed, but were hidden in a lengthy, nested menu or behind an obscure 32x32 icon in a toolbar. The big problem with the old menu/toolbar UI was a lack of discoverability. Ultimately the menu/toolbar paradigm just wasn't sufficiently scalable.
If you watch the video with a cynical mindset, you will be able to dismiss it as marketing bullshit and feel good about how you were right all along. If you watch with a truly open mind, open to being changed and willing to contemplate different ways of thinking, you might find it most enlightening.
Or you could not watch it at all on the grounds that you enjoy sneering at the ribbon, you like slagging off Microsoft for its ineptitude, and you have no intention of changing that position.