It’s unclear in the details of that setting that business day automations would be affected by this setting. Looks like it’s an issue that’s come up before ("Weekday" automation not falling on weekdays), but this could be easily resolved by a note in the admin settings explaining how this setting affects business days in the platform more than just visually.
The current description reads as a visual-only setting, and doesn’t indicate at all that the workweek setting changes to Sun-Thurs instead of Mon-Fri if Sunday is listed first.