I read your presentation. It was mostly about features in code that already existed. That is far from a justification for why you should invest in AOO. In fact, it is completely irrelevant to the topic.
At some point you will need to make an accounting for why you didn't join LibreOffice right from the start. When I add up all the pluses and minuses, it isn't even a close call, so I think it will be useful to document your thinking so that others can learn from it.
It is not absurd to think that you could have joined LibreOffice. It only still sounds absurd because you never gave it enough thought. Instead of helping LibreOffice, you are hurting it. You plan is as absurd as arguing you are going to fork the Linux kernel.
No one is suggesting we never have multiple versions of code. Just in this instance, with this 10M lines of code and given the fact that LibreOffice had just built everything you need and has a bigger and better team. You tend to justify your decisions in this situation by comparing it to other hypothetical situations. No one here is arguing for one GUI toolkit. You argue straw men rather than facts.
In general, there are a lot of naive people who don't understand what is going on, and so getting the facts out can help minimize the damage. IBM could have come up with a much better plan. Brains != common sense