I think that is a very un-serious argument with no consistency.

Microsoft has always sold a cheaper "office suite" without outlook. What businesses have historically bundled and not bundled is irrelevant to what is best for society going forward.

Surely there were many features that many software businesses add that weren't there before. What if Microsoft relabeled Teams to be part of Outlook? Like they made Calendars part of Outlook. It all feels like starting at the result and working backwards towards a justification.