Libre Office is a wonderful concept, but like the learning curve of the human brain there is a parallel curve called "compatibility".

I used Libre Office as a test, and if all you want is a spreadsheet matrix, or word processor text manipulation then it will do a lot. It is a tool like others, and styled to look as close as it can to Micro$oft Office, though I suspect 2000/2003 versions.

But if you have built a suite of automation based on MS VBA (macros), you may well (I did) come up with subtle differences with no simple work around. Compatibility is not complete, and may be mediated by Micro$oft patents or copyright. So you ask yourself, do I want to play at programming and re-aquainting myself with decisions I made 10 years ago, and marvel at my inconsistency, and naiveity? The blow to my ego is trivial, the time to find all the bugs is not. They may not surface unless I read and compare the results in minute detail. I have already spent 10 years refining and de-bugging, can I be resigned to all that again?

Again it is learning knew stuff. When all we want is a tool. Getting a new "tool" because it is new (to us) is on par with "TOYS for the boys".

I have a tool, it is red it is worn at the edges, my brain instinctively knows to "xxy" before I "ZZZ". It feels comfortable in my hands. If I buy a new tool I may well cut myself before my brain teaches my hand to move as the tool "MMM's". So I get another tool that looks and feels like the old blunt one did.
It is a Victorinox Swiss Army knife, a Wenger one would have done the mostly same jobs, has a certain rarity cache, but the Victorinox is familar. Fits my hand. So it is with computer OS's, and all that other software.
We all champion what we chose, because to do otherwise would make us look like we chose badly. But is a Ferrari any better than a Lamborgini? NO, they are both phallic extensions. But jump into the other and what could happen while the brain familiarises to the knew one! Computers mistakes likewise - cost & bruise egos, but at least wouldn't kill.