No sure what incompatibilities with Office you're talking about as I have never experienced that. But if your machine won't even boot up properly it sounds like something may actually be wrong with your device. Mine has been a really solid device and rarely crashes.
As I said previously in this thread, it's really unfortunate that you all were mis-lead (by sales people?) as far as what this device is capable of, and the details of the current limitations. Definitely always do your own research. It is a great device for what it is intended for - a thin, light, always connected convertible, that gets better battery life that the Pro 7. But for anyone that requires an x64 app right now, it's definitely the wrong device. That'll change in the future, and it's definitely frustrating that support would have said was x64 emulation was coming Jan 2021 as that was wrong information (unless they were talking about insider builds, though I wouldn't expect them to recommend switching to a potentially buggy build).
I fell in love with Surface Pro X when it was announced in autumn 2019. I was researching Windows 10 on ARM64 laptops like HP Envy X2 (or something like that), but was holding back knowing that these things are 4GB RAM only, which is too little for me.
I knew all the limitations of ARM64 and the biggest one I´ve foreseen was lack of software for OpenVPN, but that came almost immediately from Sparklabs (Viscosity).
In my hands Surface Pro X (16 GB RAM) with Office 365 runs faster then on Intel i7 (32 GB RAM) from late 2018. I also use Java 16 JRE from Microsoft to run some Java 64 bit apps and it is very smooth with image processing (PMOD, www.pmod.com) as fast as on mentioned Intel.
I got Ubuntu and Xwindows (VcXsrv), hoping to get some graphical Linux 64 bit apps to run. Here comes the disappointment: most of them are tied to AMD64 compilations for Linux (Edge, Mathematica), so I think I will need to wait for x64 emulation, unless I may get a custom build for ARM64 Windows 10 from Wolfram.
I had an unpleasant experience with my first Surface Pro X. It was restarting when I plugged charging cable when it was in sleep mode. The reseller confirmed that, and I got a substitute in one week (Spain, shipped from The Netherland). Now it runs perfect.
The best experience of Surface Pro X is the new type of pen and writing on the screen on PowerPoint presentations, not to say a touch screen.
So, waiting to get x64 emulation in official Windows 10 for ARM64 build....
MarcinB.