It has many disadvantages in terms of functionality. Some advantages could be: theming (line-height, inner margins, inner max-width), runs in the browser, easy to modify and build upon, produces HTML output.

I haven't tried the subject of this thread, but since I upgraded to Windows 10, the notes application has become ridiculously slow. Sometimes I have to wait, and wait, for it to respond to clicking or typing. I assume because it's doing some sort of network/AI enabled nonsense.

>the notes application has become ridiculously slow

the win32 one, or did they replace it with a metro/modern version?

I'm using 64-bit Windows 10. It looks like it has some subtle visual updates, but I'm not sure what might have been changed under the hood. It seems to frequently hang when I try to paste into it, for an interminable amount of time.

They haven't.

While the page doesn't use js, it is there for you to use.

document.body.innerText += 'hello world/n';

    echo hello world >> file_in_notepad.txt

Although I'll admit that notepad's not as graceful about multiple programs editing files.