Split screen can come in handy if you need something on screen, while doing something else.
Same goes for pin to screen from the edge panel, very handy for a quick cut n paste and hold on top of other apps.
But you can also run apps in pop up view, straight from the recents button.
I've also got the assistant menu running with a high level of opacity so it's not that visible, it gives the option for instant pull down of notifications with one press, but more importantly it allows you to answer calls, cancel alarms etc without the need to swipe, so just one press does the job.
For copy and past I hold my finger on the txt I wish to copy then highlight and copy is there an easier way then lol.
I was going to get s8 ultra at some point but might just use the phone as my tablet and pc as I don't have a pc and have the ipad air 2 which is around 8 years old