Yeah, just download LibreOffice or use a free service like Google Docs.

Wasn't there an anti trust or monopoly suite against Microsoft for bundled IE back in the day? Funny how times change, though I agree it's not easy to get a preferred browser without one. Mean it never was overly simple but they were on so many CDs mailed out back then. Think it has to do with some IE and Windows integration too so not just cause they bundled it.

Better yet, the OS should just include a desktop environment with simple utilities and a package manager to install the applications you want. It will make users less likely to run into malware while searching for the programs in the web

I think a file manager, text editor and command prompt are pretty essential too. And when you've added those, where exactly is the limit where it becomes "application software"?

I think it's worth separating the two related but distinct concepts of what is a part of the operating system itself (for example, the actual file manager) and what is pre-installed or bundled with the operating system (games like Minesweeper).

I agree with you that a rich text editor definitely shouldn't be part of the OS. But should it be a bundled part that ships with the desktop environment, the way Windows/MacOS/Android/iOS/ChromeOS all come with photo library software, basic image editors, media players, browser, email client, etc.? These applications aren't strictly necessary to use or maintain the system itself, so maybe they shouldn't have some kind of privileged use of the OS's functionality, but there's no harm in bundling in the installation defaults.

I don't think a rich text editor is an important enough function to necessarily be preinstalled with the OS, but I can see an argument, at least. There's a reason why Windows shipped with one since the beginning, and why MacOS and KDE and Gnome each have a default that very few people actually use regularly.