If you don't care that random X11 applications (e.g. your browser) can snoop keystrokes and mouse events or make screengrabs of any other X11 application.

But it doesn't matter anyway, because any application can grab any data from your home directory.

Unless you use Flatpak, bubblewrap, or some other sandboxing technology.

Disclaimer: I use Linux 95% of the time. But we should be honest about the shortcomings. Desktop Linux is not secure and you only have privacy if you trust all of your applications.