More precisely: He said MSlers get paid by results, achieved Business Value. Testers exist and are called "End Users". Testing is mandatory and part of the core philosophy - they just must do it differently.
Reason: Fear of missing out if moving to slow.
I reminisce the times, where you put in a CD without internet connection. Actual Office is a mess. Thousands of half finished apps, subject to be cancelled anytime. Windows XP's UI was dubbed "glossy" - some of Office's apps UIs are LSD trips for kids. This is ridiculous. Nothing to work with and in no way usable for customer presentations.