The only reason I'd want Apache Open Office to merge into / with / from LibreOffice is this: To get the overall better suite, LO, using some of the uniquely cool features in IBM's very different fork of OO.o into IBM Lotus Symphony. Which, for those who remember the end-of-CP/M-start-of-PC era, has nada to do with Lotus Symphony, Lotus Development's follow-on to Lotus 1-2-3, which never met with its predecessor's success. But, it was a very early attempt at an "office suite" (spreadsheet-centric, MS/PC-DOS-based). So IBM got the name/trademark when they bought Lotus.
Around 2010-ish, they released IBM Lotus Symphony, a Win32, Linux, and I think MacOS, office suite based on OO.o core code - but with a lot of differences. Differences in 3 big areas:
1) Only the 3 major apps - Word Processing, Spreadsheet, and Presentations. Nothing based on Draw, Math, Base.
2) Very different and non-standard menu structure, that hearkens back to Lotus Windows products. For example, no Windows (and IBM SAA, and just normal)-standard "Insert" menu - most of what you expect there is in its "Create" menu.
3) Everything is in a single window, tabbed interface, with multiple slide-out right sidebars: A wide, well-organized Properties panel, and some widget panels for add-ons. Based on the Lotus Expeditor framework for the devilspawn Lotus Notes. Yet sometimes the son of the devil can be a good guy (e.g. Hellboy).
Number 3 has made it my absolute favorite office suite. For the same reasons we all love tabbed browsers and trashed browsers back in the day that didn't have it. Everything is right there, in context, without too much window-hopping. The Properties panel exposes all the major properties without having to dig through menus and open different dialog boxes depending on if you're formatting colors, number types, custom cell formatting, etc., and without having to crap up a giant multiline toolbar or frakking ribbon to make functions discoverable.
I go back far enough to have been used to different word processors and different spreadsheet programs to have different interfaces and menu structures, even different keyboard shortcuts. Heck, I even remember some of the differences in that between WordStar (real WordStar, up through 3.3), its competitor NewWord that cloned it and then got HandSpringed into WordStar 4.0 (Yes, I still have WordStar 7.0 on my Windows 7 and Windows 8 PCs). Then some time with Ami Pro, on both OS/2 and Windows 3.x, that later became Lotus WordPro (that one I didn't use), with a short sidetrip into WordPerfect for Windows, before being funneled into the Corporate Tool MS-Word world, and then slightly out to OO.o/LO. So I can make the mental shift between different menu structures pretty easily.
I love the property panel as well as the tabbed interface. Unfortunately, though IBM donated the entire codebase to Apache, they are not using the tabbed interface in AOO. They are starting to use, and announced they will fully implement, the Symphony-based property panels. That alone would make me likely go back to OpenOffice from LibreOffice, except that LibreOffice is so far ahead of AOO in functionality, stability, and killing off of Java.
For now, I still use Symphony, on both Windows and Linux. It continues to get the occasional FixPack (IBMese for service pack) and continues to Just Work. Especially on creative writing where I may have reference docs, character backgrounds, outlines all open, or similarly for technical writing, the tabbed interface really helps to keep everything accessible and surfaced. Also for projects involving a combo of word processing documents and spreadsheets, and [$DEITY] help me sometimes even presentations - it's a lot easier to work everything up if I have that clear context, rather than a cluster of windows.
I do keep LO installed, for when I want the other modules, and for dealing with editing documents in MS .docx, .xlsx, .pptx format. Symphony can open them, and in fact has IBM-coded improved filters compared to what was in OO.o that went into the Apache donation from Oracle of OO.o to become AOO. But it can't write to those formats. LO still handles that fine.
The only other significant issue, which may not matter to you one whit, is that Symphony's default word processing document style template uses sans-serif fonts, while OO.o, AOO, LO follow the MS-Word convention of serif. Obviously you can change that. But if you're a Corporate Tool that may be important. I'm now a Former Corporate Tool, so I don't care!
IBM Lotus Symphony is still available free from IBM for download if you want to try it - free as in beer, not 100% of it free as in freedom.