Linux

Nexusmods.

Games :(

From macOS: that the basics in UI are so much more consistent and just work. For example shortcuts across apps. This makes me insanely productive.

I honestly loved some of the default Windows apps, like Notepad, Paint and believe it or not, the default file manager. I find that most file explorers on Linux can't strike a good balance between simplicity and the amount of features.

Thankfully (or not, if you use Windows) they started enshittifying each and every one of them, so there's nothing to miss any more.

I'd say a Control Panel, I miss the plethora of authoritive knowledge and settings for every program, device, driver, network, user, and a dozen more things besides, all findable by browsing and not remembering dozens of commands. Of course I'd miss that either way, because Control Panel has been gutted every new version of windows since XP, but it was once nice.

The Start menu context menu, or SUPER+X, is still nice, although mostly for avoiding poor UI choices and slow menus. The fact that many useful options are guaranteed to be there on every windows machine is nice though.

And I would also say Event Viewer, despite how incredibly clunky it is to use. Having one place to check all system logs and track crashes of all kinds was quite useful.

Basically, windows at one point went out of it's way to centralize settings and info, and that's just not possible in Linux without a lot of setup.

I'm 100% sure that Raspberry Pi has that. I can set how much of ram will go for the gpu. But raspberry pi's gpu isn't really a gpu.

I miss my computer's performance being held hostage by "Active Protection" feature of Virus scanner!

I miss targeted advertisements. It's important that my OS tracks what my interests are, so that I can be served more relevant advertising.

Advertising that doesn't know my interests doesn't hold my interest, and having no ads means that I have no idea what I'm supposed to purchase next. It's crazy.

Windows' lightweight photo editing thing. Great for highlighting screenshots.

All image editing software on linux (that I've tried) is 10x more clunky.

Game pass

Tax software solutions with my state included. I can't use the EZ online file options.

Being able to operate without a keyboard. Perfect for home theatre pc

On Windows, there used to be (possibly a third-party application) a desktop widget that had a "turtle", and if you clicked on the widget it would drop a little pixel of food, and the turtle would slowly walk over to it and consume it. I thought that was really cool.