My buddies and I have worked at companies that went through similar transitions and reversions.

The issue is not the cost or even the ideology. It is the training and support. There are a LOT of really good training resources for MS Office and, at least for millennials, outright education in k-12. So, by switching to libre office or anything similar, you are suddenly putting a large burden on yourself and random enthusiast youtubers who will start advertising nordvpn partway through explaining what a pivot table is. Because the vast majority of people don't know how to google "how to edit the footer for slides in Libre Office"

And that RAPIDLY adds up to being a lot more expensive than even the full priced licenses from MS. your more technically competent staff suddenly have very large support burdens because "Oh, I just have a quick question" and that increases their burnout.

That said, it is going to be really interesting in the next 5-10 years (... assuming the world doesn't end in a series of thermonuclear explosions first) since gen-z are very much brought up on Google Docs and the like. So even MS Office will have a significant training overhead for new hires.

At one of my other jobs we had to migrate a codebase from SVN to Git. it... was incredibly overdue and it was making for a greater burden on new hires who had to learn an antiquated toolset to contribute. But it was a genuine concern because most of the existing developers who understood "where the bodies were buried" had already "suffered through giving up on CVS for no good reason". And we genuinely had to acknowledge that we would lose staff "on both sides" and, while I am not proud to admit it, more or less set up a few underperforming early career staff to be sacrificial lambs. Making it a point to let Old Fuck #5 know that the guy who was struggling to understanding how to write performant kernels was available to work through how to write a commit message. That way the rock stars who we were dependent on would not put in their notice.