What it comes down to is really "what do Android buyers expect from an Android device?"

If the consumers expect that they will get email, cloud storage, calendars, and maps then it would likely be fine for Microsoft to create similar integrations. If consumers expect that they will get Gmail, Google Drive, Google Calendars, and Google Maps, then they will likely be disappointed.

Remember there are billions of people who haven't already been locked into Google services. They don't think "I need access to my years and gigabytes worth of Gmail." They think "I want email. This 'outlook.com' thing that came with my [hypothetical MS Android] phone will work fine"