I'm probably OK with this. We had it in a few interfaces as a test more or less and I think it's been a year now -- it would likely be useful just everywhere. Added @epriestley for any additional thoughts.

One general issue with this is that after you edit the task, it may no longer belong in the view you're looking at.

A simple example is that you're viewing "Open Tasks", and you edit a task and close it. We'll update the card, but it will no longer truly belong in the view.

A more complex example is that you're viewing a workboard, and you edit a task and remove it from the project you're looking at. We'll update the card, but it will no longer truly be part of the workboard, and if you try to move it around it shouldn't really work.

I think this is mostly OK and not hard to understand (and it would be worse to ninja-vanish tasks in most cases), but probably does need some attention, especially in cases like workboards. In the simple case it might be good enough to just mark it with some "edited" style. In the workboards case, we should probably go a step further and make it clear that the task is no longer on the board, prevent you from reorganizing it, and probably give you some way to dismiss it.