> The operating system that runs on a system has no bearing on how the data for various applications is stored
It's not impossible for a motivated user to go against every UI (dark) pattern to keep work on an open format, but it's so unlikely as to be irrelevant.
While the file formats may be open, it's widely known that MS keep enough secret sauce in Office so that an MS Excel nightmare won't open correctly in LibreOffice. Being able to decompress and parse the contents of the file (the open part) is not the same as humans being able to interactively retrieve information from it.
The user's intuition is to blame LibreOffice, but as technologists we should recognize that if you won't ship a working reference implementation for effective use of your 'open standard', then it's just malicious marketing.
It's not impossible for a motivated user to go against every UI (dark) pattern to keep work on an open format, but it's so unlikely as to be irrelevant.
While the file formats may be open, it's widely known that MS keep enough secret sauce in Office so that an MS Excel nightmare won't open correctly in LibreOffice. Being able to decompress and parse the contents of the file (the open part) is not the same as humans being able to interactively retrieve information from it.
The user's intuition is to blame LibreOffice, but as technologists we should recognize that if you won't ship a working reference implementation for effective use of your 'open standard', then it's just malicious marketing.