It's good that LibreOffice exists and it can be a decent replacement for someone writing a simple document every once in a while. I can not take anyone seriously who claims it is anywhere near as good as the MS stuff. Recently I created a presentation in Impress and it was hell on earth. I ran into multiple bugs and handling formatting was just horrid working with the master/template slides (or whatever they are called) was essentially impossible.
Currently working with OnlyOffice which works better by a considerable margin.
Without some sort of reproducible builds (which are really finnickey to actually get) this doesn't really help though. Adding some set of malicious patches before doing the binary release is trivial.