Can you even link to a single technically competent offensive specialist that states a Microsoft system would be difficult to break into? Just to make it concrete, let’s go with a really low bar like one skilled person over one year.

For that matter, can you link to anybody technically competent at Microsoft who would dare to make a claim like that and then actually back it up with experimental evidence? No point listening to the blather of the Microsoft PR team when the silence of the technical team tells you all you need to know.