I talked once to the OpenOffice maintainers (there was no LibreOffice yet) - they were really open for contributions.

But I still did not contribute, because their understanding of a good UI was not what I had in mind.

They are office people.

(At least at that time, but I don't think that changed)

And I was used to how graphical design software worked. I would have had to fork and that was out of my scope.