They explain it on their website : their internal logic for a document is based on OOXML logic, while LO is rather based on a ODT-based logic. So compatibility with Office is more straightforward in OO (though we know Microsoft is not quite exactly following the OOXML norm, so still not perfect…)
It’s not just UI wise.
They explain it on their website : their internal logic for a document is based on OOXML logic, while LO is rather based on a ODT-based logic. So compatibility with Office is more straightforward in OO (though we know Microsoft is not quite exactly following the OOXML norm, so still not perfect…)