Again, the port is done - Windows ARM is available for ARMv8-A devices just like it is available for x86 and x64 devices. I am not arguing the hardness of such a port because it is existing and maintained.
You seem to be fixated on a very narrow definition of “port” (fixing and recompiling the hardware independent parts to ensure true independence). I am using an equally valid but more expansive definition (everything that is needed to ensure that it runs on a particular hardware platform). However, since you cannot get past your definition, I will use a different word: package. Someone needs to package Microsoft’s Arm-based Windows version with its drivers and any other changes that might be needed to ensure maximum performance, and do the QA to ensure it all works.
My second argument was about the drivers - which Microsoft never provides for a particular HW - does not matter if this HW is ARM based or x86/x64 based.
Again, I guess it really depends on your definition of “provides”. It is possible that Microsoft might not write any drivers (they certainly used to write some of them, but I have not really kept up on their current policies), but given that one can buy various computers from Microsoft, I am pretty sure that they come actually working and that it is not like the bad old days where before one can start using one’s brand new Surface Book RT one first has to insert a floppy with all the drivers for the sound interface, the SSD,
etc., in addition, if I start with most new systems (even those I build myself), I rarely need to download new drivers or install them from other media. Most are included in the install package
provided by Microsoft to the end user installing the software. You can argue all you want that they did not really provide them, but as the end user, any problems I have with the standard drivers are going to go to Microsoft support not to Qualcomm,
etc.
This has several reasons - among others is that certain HW implementation details needed for writing a driver are considered secrets.
In this case, whoever packages Windows for Apple Silicon will be responsible for writing, getting someone else to write or including the drivers needed to make a complete package. If the consumer told: Download this from place 1, then this from place 2, then this from place 3, and so on, they will sell about 5 copies of this software.
It may not be Microsoft who does the packaging, but I am pretty sure it is not going to be Apple this time.