I don’t use the Word replacement but I do use Calc (excel replacement). I very often want to run calculations or chart a bit of data and use Calc for that. Yeah I could use Google sheets, but every time I want to use it I have to go get my phone out to MFA. Far easier to just type “calc”.
I do not use any other features of LibreOffice.
At work I use the standalone power point and excel. I am not collaborating 99% of the time, and Microsoft Office has mechanisms for collaborating & sharing if I do. Using the browser always feels second class with some options moved or hard to find. Of course YMMV.
But what are you both thinking you’ll archive?