There really isn't much of a UI/function difference of the newer Libre PPC build, I'd go as far to say the "updated" release could be font/menu rendering tweaks, plug up any Java holes/bugs to the database function which IBM has been doing for OpenOffice. (I use Libre on Linux & BSD)
OpenOffice hasn't really improved or changed much, last I heard/read the IBM fork(Symphony) was rolled into the OpenOffice source to aid in the removal of most of the Java dependencies(Java is only needed for Database), security holes and some ugly font rendering bugs. Hasn't been much going on since fall 2013/spring 2014, I sense much of the support has come from IBM.
As much as I hate funding Microsoft, still have to deal with MS Office 2007/2010/2013 files which render like crap in OpenOffice/LibreOffice. Importing to Google Docs or OneDrive/OfficeOnline typically works if I'm not near/using a Mac but its a pain in the rear.
One tip of advice Office Starter 2010 which was preloaded with many early Win7 PCs doesn't open some Word/Excel 2013 or 2016 files unless they were saved as a specific previous version so I'm guessing Microsoft is trying to sway users to upgrade. (Office Starter 2010 had a neat function to make a portable USB edition to use on any computer and works on Win10 too)