Linux

I think Windows does some things well, that are just worse in KDE

• Ctrl+Alt+Delete, Taskmanager is actually privileged and can force close running apps. On KDE the same apps exist but they are not privileged enough. EDIT: of course it is privileged, but it doesnt even open if the "Desktop" hangs. There seems to be no privilege isolation, nothing left as security space for these tasks.
• The UI is more stable, the bars dont weirdly load, App Windows just open in full size and not fly around. When an app crashes I can still use the cursor (often)

The Rest is crap, like everything. Updates are horrible and intrusive without a single reason. Immutable updates are so much better, regular Linux Distros probably cant compare regarding security.

Eh, I can't use windows for any longer amount of time. I am WAY too paranoid. I always get the feeling of being spied on when I use windows. Like this slight nagging feeling in the back of my head. Never at ease as I am with linux.

Insync supports OneDrive on Linux, been using it for a long time although I don’t touch cloud storage that much. I like having local copies of everything that does happen to be in the cloud.

Have you considered Bitwig Studio? It has native linux support.

Running FOSS is practical for the long term, even beyond moral judgments. Proprietary software starts strong with lots of funding, but it only gets worse and worse as it goes along. Open source starts slower but plays the long game. You can take a look at something like Windows itself for an example of the gradual infestation of ads and user-hostile features/tracking. It's never going to get better. The only hope for proprietary users is for a new proprietary app to be created and start off more user-friendly because they need to attract users. Once they have the users they'll restart the cycle again.