Most operating systems have matured and are good enough for personal use nowadays, bar the use of some specific softare (design, imaging, etc), which is not always available for Linux.
And LibreOffice is mature enough for most needs.
What is not true however is that Microsoft is the universal evil (it used to be, but sadly many companies nowadays are way nastier than it is) and especially that anybody, using Microsoft products for any reason at all, is an idiot. And those are statements that are around a lot.
Fintech companies, engineering companies and such, use tools and often - Excel add-ins, where the whole Windows system - hardware and all - is but a pale drop in the bucket of what was paid for that specific tool or add-on.
Especially for Excel, one can praise alternatives till they foam at the mouth - the second some obscure Excel plugin that no one ever heard about, but that fintech can't live without, is mentioned - that's it. It needs Excel to run, period. Data Science will scream for Linux - they'll get it on WSL to run on their Windows machine with Docker and whatnot, then they'll pull that table with 2-million rows and gazillion pivot points, and that fat add-in that only exists for Excel, and will let it churn overnight. We're not talking viscosity chart on two sheets here, we're talking live populating of a boatload of cells and rows from different sources and whatnot.
At the end of the day those are tools, and you need the tool that does the job and most important - on which the operator is trained. Most design shops are on Apple not because Macs are better - it's simply because they were bred and fed on Macs in design schools, and that's what they know and understand. Persuading a good designer to work in a Windows shop will require higher pay, or retraining - both things that negate whatever savings were made by putting them on Windows vs Mac (and those are not even that different in price nowadays, as the Photoshop and Illustrator subscription costs the same between the two).