We are expanding support of lightweight formatting to include additional Markdown syntax features. This includes strikethrough formatting and nested lists. To get started, explore these new options in the formatting toolbar, keyboard shortcuts, or by editing the Markdown syntax directly.
Source: Microsoft.
And take even longer to launch than it already does. No thanks. A text editor should be a simple text editor. If I wanted anything more complex, I'd use LaTeX.
Personally, I restore the classic Paint, Notepad and Snipping Tool from Windows 10 on my Windows 11 machines because they launch instantly and don't have AI slop baked into them. You can uninstall the "new" versions of these apps that come with Windows 11 or leave them and have both. I personally uninstall them.
I even set up these "classic" apps to be my defaults where the "new" versions were before. Everything works perfectly.
For those interested, I wrote a guide on how to do this manually yourself: https://pastebin.com/1WAs38AP
The fact you need a guide to get a working Notepad and Paint back says everything about the state of Windows 11 and Microsoft.