Both my colleagues already provided some details, but I’ll also share some “backend” issues?tips?hidden secret knowledges?.
As we’re working on Blocks, its implementation would entail Entity View full redesign.
So if we change smth there (for example, will add Buttons, ability to hide fields, relation filed filtering and etc.), we would have to redesign it one more time (and for some cases full implementation will be required)
So we do really note every request, and once the main work on Blocks would be finished, it will be much easier for us to prioritize some requests and give better eta, than “someday” 
So, this great feature has to wait a bit more before the kickstart (and on my own, I do also wait so much for it because that three dots pattern is definitely not my favorite one). And once there will be any progress, would be glad to notify you here 