Whenever LibreOffice is mentioned, I have repeatedly seen driveby OnlyOffice boosters claiming it's perfectly compatible with MS Office and much more so than LO.
As far as I can tell, the entire basis for this claim is OnlyOffice using OOXML as its default file format and the company claiming that means perfect compatibility.
Of course, it does no such thing.
I know of no actual head to head comparative feature list, tests, example documents that work in OO but fail in LO, or something else substantive.
(The boosters always vanish in the wind when asked this.)
Does anyone else have something like this?