People don't have a problem changing if the change doesn't break their work(flows). The fact that Internet Explorer is pretty much dead proves it - everyone switched to Chrome although is different.
MS Office document format support is simply not good enough on any alternative (of which Libre Office is the only serious contender).
I have tried to switch to Libre Office on multiple occasions over the years, but every time I gave up after couple of weeks of frustration, because I couldn't collaborate on shared documents. Either the stuff I created in Libre Office looked different when others open it in MS Office, or I was breaking the documents for other people.
I don't consider MS Office to be better - it's simply that the alternatives are not compatible.