I wouldn't call it "seamless"; a lot of Windows applications don't work. An example is some software packages common in the construction industry which want to

I wouldn't call it "seamless"; a lot of Windows applications don't work. An example is some software packages common in the construction industry which want to install all kinds of ancient x86-only thing likes old ODBC drivers. So that wipes out one of the compelling reasons to have a Windows laptop. Quickbooks (Enterprise Desktop) is another example of one; not supported on ARM, although with some hacking you can get it to sort of work.