Libre Office is OK, but let's not pretend you can just slot it in to an office's install image in place of MS Office and expect it to work. That will not work.
MS has been to a lot of trouble to make Office customisable. What with styles and templates and formulas and macros, you don't even know *what* anyone else's install is capable of. And then there are a shedload of third-party tools that integrate with Office - again, you can't simply point those at Libre instead and expect anything but total chaos.
It's just not the same thing, and you're not doing anyone favours by pretending it is.