I use libreoffice and onlyoffice daily for academic works, with a few works published out there. I even use more features than the average office user, and I have to listen to people claiming that they can't use any of those, because they're inferior. I even have to listen to people saying that libreoffice isn't suited for doing any SERIOUS WORK, and I'm like "What? My work isn't serious?".
But tne other user got a point. People want to see the name and the ms office logo. They will reject any alternative just because is isn't ms office, no matter how good and sufficient they are.