Soo, I went ahead and did the upgrade, somwhat under trepidation since I'm using a Gen 10 iPad. It is definitely a different beast. I can't swear to it but it is almost as if there is a Mac version available of an app it will execute that instead of an iOS version. I'm probably wrong here but some apps are totally different. One such use case is Google Docs. For some reason I can't fugre out how to switch language input. I tendo to switch back and forth between four or five different languages but now I'm stuck in English.

Multitaskning is greatly improved, lots of windows open, easy to resize and move around. The Files app now provides an Open with... option.