Could someone describe what's the difference between LibreOffice approach and GoOo approach now? Why didn't they build on GoOo, but forked again instead?
Go-OO is maintained as a series of patches which can be applied independently by distributions to add or remove features; this is intended to replace the OOo project entirely.
Or, to try and use a historical analogy, this is the tipping point from 'a patchy server' to Apache.