One word: Excel.

Nothing in the open source world comes close, even for me, a far-less-than-average user of Excel.

And then there's years of software I've used and own, and will have to find a replacement for, and figure out new ways of doing things I've done for 10+ years (more like 30+ years). Hell, I have close to 20 years of notes in OneNote. Transitioning that to anything else is a nightmare to even think about.

No thanks, I seriously don't have time for that, when I have extant Linux servers to manage.

"Just go Linux" is so tiresome because it's simplistic - there are so many things such a statement assumes and ignores - and I use Linux every day, just not as a desktop.