The Apache Foundation could simply have accepted the OpenOffice.org codebase+trademarks from Oracle, then donate to LibreOffice.
But they did not do so. The Apache Foundation does not have experience with software that end-users use. They have experience with server software. That was their undoing.
Committing on both repositories is not practical, because the source code has diverged too much between the two. It's now too much effort and requires brain power to do.
I have not seen blame from LibreOffice developers
and I do not understand what is being said in the AOO discussion.
Instead, the Apache OpenOpenOffice people took advantage of the openoffice.org domain.
They should have put on openoffice.org that the old OOo has been forked into AOO, LibreOffice and NeoOffice.
However, what they did is not mention at all that LibreOffice is one of the options out of the defunct OpenOffice.org.
But they did not do so. The Apache Foundation does not have experience with software that end-users use. They have experience with server software. That was their undoing.