Is there are better way to use the new prefab system + example video of problems.

So first off I find the new system very clunky. I get the prefab editor is supposed to help with not accidentally breaking prefabs in unity, but a better system to undo prefab changes seems it would be better, and much less of a time waster. Also here is a video of all the drag and drop issues I am having with the new system. Is there a better way, or settings I am missing? Also one thing I forgot in the video if you take out a part of a prefab like at the end of the video, you can't undo it with "ctrl-z".

 

Also why can't drag and drop items act like copy pasting them into a prefab???!!!