You can try to use LibreOffice all you want, until you receive a form to fill where LibreOffice doesn't display checkboxes and recipient won't accept "x", because their automated software only uses MS Office and won't properly attribute it to questions.

Yep, I've seen this come up time and time again in the legal world and Microsoft 365 is so entrenched in the legal world that there is 0 chance of change in at least the next decade, and probably in the next 20 years.