As someone who focuses on cybersecurity for Microsoft, I can attest that this article is factually untrue. Microsoft Defender still protects Windows workstations from malware and viruses even if you use Chrome or some other productivity applications. The nuance is that SmartScreen (which is an element of the Defender suite of capabilities) would not be natively integrated into Chrome. HOWEVER, there is a browser extension for Chrome (and Firefox) so that it can be re-added. As for the productivity application integration, I dont even know what that means in the context of Office and once again, I talk about this publicly for a living. You would still be protected regardless of the productivity application used.