Why should we save in ODF format with LibreOffice?
What is the Open Document Format (ODF)?
What are the advantages and disadvantages compared to third-party formats?
For the same reason, why you save Word documents in docx, Excel spreadsheets in xlsx, Photoshop paintings in psd and video projects in the format of the video editing software you are using right now.
All software that stores your work in files has its own file format which can store each and every feature you can use with that software.
5 Likes
5 Likes
Note that, for all of the openness of ODF, the reference implementation exemplified by LibreOffice has nonetheless managed to produce ODB files which have been incompatible with either earlier, or later versions, depending on the viewpoint in time.
While any claims that ODF is a “perfect” format, guaranteeing zero chance of incompatibility, is a nonsense, the ODB case is special (it necessarily depends on either external connection, or to a BLOB which is outside of the ODF standard). Also, “incompatible with earlier versions” is absolutely off-topic here: e.g., newer encryption schemes will legitimately make such an encrypted document produced by a later version incompatible with an earlier version, nothing to see here.
First of all, not every case of “version X can’t open file from version X-1” fits. If that is a bug, it’s just bug, not an example of the promise not held.
Then, a failure to open something generated by a pre-release version, or when experimental options are enabled, do not fit. E.g., the ODBs with older version (2.x) of Firebird database, which could be generated during the development cycle.
So - specific references are needed to discuss, not just some other claim that has no specific ground 
(and yes, I myself fixed something in Base in a way that had to break compatibility - just don’t remember a specific case, and if that was like “ver.X can’t open ODB from ver.X-1”).