My first OS that provided pen supportwas "Windows for Pen computing" back in 1995!
Since then I am sold on this idea but I found no OS, yet, that really, handles this decently such that one could really operate a Computer with a pen only also for complex tasks.
Unfortunately, Windows10 is no exception and while the bare character reco has improved dramatically since then, the reco and interpretation of gestures is IMHO even worse than it was in Windows 7 back then!

Not even the appearance of the input panel