Windows 10 S might as well be RT v2.0: users won't like not being able to run the software of their choice, regardless of the reasons why. (Which is why last time I heard MS was offering paid updates to the non-S version of Windows 10).
As for different stances that you seem to have chosen/been paid not to understand, Google may be willing to play ball with Apple for the reasons already stated, plus the fact Apple have a large number of valuable users on their popular store. Microsoft's store, on the other hand, is a ghost town full of nothing much and isn't worth the effort even IF Google was willing to tarnish the Chrome name by putting a wrapper and their logo on something as inferior as IE/Edge. It'd be like asking BMW to put their badge on junk yard scrapper cars that barely run and inflicted all kinds of problems on the user. Why would anyone want to tarnish their brand by being associated with Microsoft's junk?