I use it because I don't have to use Windows to use Office, and it was really cheap with a discount I got. I think it was only $15.
I could have got the 2019 Mac version for the same amount, but I waited to long, and the discount that I used to get via my employer has changed to the Office 360 subscription @ $10 a month. Not worth it to me.
Seems like everyone is going to subscriptions....
I am now kicking myself for not purchasing Office 2019 @ $15 when I had the chance to.
I have both Mac and Windows versions of Office 365 installed (Excel, Word, PowerPoint). Most of the time, I use them on the Windows side in Parallels, because of better text-to-speech options in my languages.
If I do not need TTS, sometimes I work with the files in Excel for Mac due to a smoother scrolling.
I use both, but mostly the Windows version via Bootcamp, for 2 main reasons...
1) the Mac versions is slower, missing some features/customisations
2) because the results are not 100% the same (99.5% possibly), and I sometimes have clients where the Mac created file renders slightly differently on their Windows version, so I try to match OS to the client to be certain and reduce rework.