I'm not sure I see how the absence of a revision tracking system rises to a violation of sacred principles.
Rather they're company marketing sites. That's certainly what I used WPEngine for, and the service was well made, particularly their ability to test WP updates in staging.
This whole line of thinking—one person defining the “core tenet” or whatever—seems directly contrary to the ethos of open source. If Matt doesn’t think people should be able to turn off revisions, he should put that in the license. Otherwise, users can do what they want and open source leaders should celebrate that.