Can you move one task from one list to another list fairly easily?
Yup, you can drag and hold one or multiple items like you would rearrange them on that current list. But instead, keep a hold of the held lists and click the invisible button on the bottom while held, then drop it onto the new list. Hope this helps.
Or if you’ve disabled the invisible back button, you can drag and hold one or multiple items with your index finger, then pinch with your thumb and middle finger (as you would to get back to My Lists) then hover over and drop onto the new list.
A variation of this is you can use two hands: drag the item/s with your finger, then use your other hand to pinch, then hover over the new list for a second, and drop the item/s.
It takes a little practice, for sure. But I prefer these to the invisible back button method.