There are a lot of alternatives to the MS Outlook binary though in a mixed environment, as your use of iPad and iPhone shows, and most mac users will be using those as opposed to the actual outlook app. There is a web version (increasingly popular amongst corporate users), and mail.app supports outlook accounts as does the ios version of mail.app.
Perhaps some users prefer outlook.app on their mac, which is fine, and I'm sure it'll come with time, but it's hardly a deal breaker for most people who have chosen MacOS, and none of those alternatives require the outlook app itself from MS which is what this article is talking about.
