The revenue share isn't the issue with MS Office. Microsoft sells MS Office as a suite and there is no mechanism for selling a suite of applications in that manner via the Mac App Store. App bundling doesn't meet the needs MS has for this.
The O2016 applications are fully sandboxed and compliant with MAS rules but the store is not currently apple to sell the suite in the manner Microsoft desires. I expect that to be a moot point in 5 years. Microsoft has indicated to the channel that O2019 will be the last perpetual release of Office. I expect in 5 years the apps will be distributed for free with most of the functionality gated behind subscription ala the iOS Office applications (which work pretty well IMO)
Adobe Creative Cloud applications shotgun garbage across the entire system. As is they would never pass qualification for MAS distribution.