LibreOffice constantly works on improving the import of the DOC/DOCX/XLS/XLSX/etc formats, thus if something doesn't work for you, it's better to file a bug in their bugtracker[1].
[1] https://bugs.documentfoundation.org/enter_bug.cgi?format=gui...
[1] https://bugs.documentfoundation.org/enter_bug.cgi?format=gui...
I'm sure you know that's not true. I'm sure you know that developers hate taking bug reports from users even when those users have support contracts.
https://support.microsoft.com/en-us/office/how-do-i-give-fee...
https://veroniiiica.com/how-to-use-the-feedback-tool-in-micr...
b) they have automated crash report and usage telemetry to tell them what isn’t working