Apple is in a very different position than they were with the switch to Intel. Some versions of Microsoft Office lack "legacy" features like Excel macros [1] and collaborative editing [2]. Microsoft would love to run Office inside a version of Windows on the Mac, as part of an on-ramp to people buying Surface-branded hardware. Apple isn't going to be an euthastic provider of this.

[1] Works-ish on Mac, not at all on iPhone.

[2] Collaborative editing on the Mac version works until you point at a file hosted on an on-premise Sharepoint instance, then it's Windows only.