There is lots to be ironed out because it can't be that seasoned users of different levels just feel "it takes longer than before", "am i a moron?", etc. How GB is functioning today gets always in your way and makes you hard time while creating/editing content. The "logic" of its workflow often mismatches the common logic of most users. Many control options are almost randomly hidden here and there and even there...

It is simply a major UI-design failure. I do not know if there is a UI-designer in the GB team, but if yes that person should have been replaced quite long ago. If there is no such person then the management of GB team is simply incompetent.

Just take a look at the "Insert Before" and "Insert After" icons. They must have been mixed up. I mean the horizontal line represents the content i already have and has been selected and i am just about to insert a new block before the selected one. In that case the plus symbol should be above the horizontal line because that is what is logical and makes sense... so guess why in GB it is the around.
Maybe the answer is: they just do not listen.

Even the support forum of GB tells much. In the last few months they just did not give any feedback to the issues reported there. That is not something typical from a plugin that will be merged into core in some days. Maybe the GB team just can not keep up, but if thats the cause of neglecting the issues then it is simply not ready for the merge.