Ubuntu iasn’t a one and done release like windows or the apple stuff. It is constantly evolving, and runs on the newest hardware long before you ever see support from MS or the big A.
If anyone has a concern about supported hardware or CPU architecture, there is a huge official web presence complete with forums, tech and troubleshooting areas. Ask there. I personally do not have any bleeding edge equipment, but if I did, I would turn to Linux and probably the Ubuntu version of it for an OS.
Not sure exactly what you ARE saying here.
If it’s Ubuntu - you should be able to run LibreOffice which can be used to operate on most MS Office docs, spreadsheets, power-point formats.
The fact that it runs on an ARM processor isn’t relevant when you have the source code!
Now you can discuss just how well you think LibreOffice compares to MSOffice, which would be a fair discussion, but the software does work on an ARM processor too.