A big one for me is Microsoft office (desktop), Libreoffice and other FOSS alternatives just simply don't come close, and feature wise are 20 years behind. Especially since I basically mastered MS office 2007+'s drawing features, which the FOSS alternatives don't replicate very well.

And of course Microsoft loves to push Office 365. I don't pay for that and just use desktop office, but Microsoft prefers you don't know that you can do this.

And I'm going to get shit on by Lemmy big time for this but while Linux is great and has made vast improvements in recent years, I still use Windows, not only because of MS office, but because a lot of games tend to only support Windows. I know that wine and proton exist but they're not perfect and don't feel quite the same as running native.

I wish an operating system existed with a hybridized Linux and clone NT kernel (using code from FOSS Wine and ReactOS of course) so that the numerous back catalog of NT software can run similar to as intended while also interacting with Linux programs better and using a shared environment. Since it would probably become vulnerable to viruses for windows as well, maybe? (my programming knowledge is extremely rusty) an antivirus similar to Windows defender is bundled with the operating system. Hopefully if someone makes such an operating system it can be a Windows killer and would switch immediately