Launchers using Google Feed has an advantage and it's the accurate news feed personalized for each user in Google's news feed (left side swipe menu).
It's understandable, people using Google search engine more often than they use Bing engine, that gives Google more data to mine and gives Google more information about people so they can more accurately personalize the news feed for each person based on their interests, specially based on their web activity.
Microsoft Launcher is honestly beautiful, feature rich and Great. but it's news feed is not accurate enough, compared to Google feed, it's only 50% accurate, most of the news are hit and miss, not very much personalization. for example when I watch Stranger Things series and then do some web search or YouTube video search for the cast or go to a few IMDB pages, then after few hours, my Google Feed would show me trailers of the new season of Stranger Things series, or show me relevant and good news about the cast.
Google feed already knows I'm into Windows 10 so it shows me Very relevant and Useful articles that are new to me about Windows 10. all this means there are very heavy data mining going on in the background but that's good because it produces useful results. it would be even better if Microsoft was able to do the same and use that data.
Here is HOW to improve it
Google saves users' activity online in a unified place here:
If Microsoft makes an agreement with Google to let Microsoft Launcher app have permission (Only if the user fully and explicitly agrees) to access user's web activity in their Google accounts, then Microsoft can use that data to accurately personalize the news feed for each person.
that data belongs to the user, Not Google, so the user should be able (if he/she wants to) to give Microsoft access to use that data to personalize news feed for him/her.