I find the drag and drop system to move units rather untidy
1) As the same system is used to move units within stacks in a region, sometimes I miss the target, and some units are sent by mistake a long tour. Usually I realize my mistake, but it is not the first time I start a new turn with some units traveling to a distant location i didn´t intend to.
2) The movement of ships to distant places is rather painful, dragging the unit all the way across that inmense map, if you miss the intended location sometimes you are forced to get over the process again...
My suggestion, use the left click for selecting/right click for destination system, with the path showed like now, while keep the drag and drop only for managing stacks, it is standard for many games and it works fine.