The email communication preferences form is confusing.
After signing in, the page continues to display a “Sign In” element, instead of the active session profile name.
I have to reenter my email address every time. It doesn’t propagate when clicking through email update/unsubscribe links, nor does it propagate when I sign in.
Each time I visit Communication Preferences, it resets the checkboxes back to some defaults. Meaning, every time I want to tweak my settings, I have to redo 100% of them, instead of just the ones I want to change from the current state. The shown checkbox states do not reflect the current settings.
There’s no option to disable system notifications, such as for telemetry validation errors.