there is a difference between node based control and what is in RB, although they are similar.

In RB, in order to create a smooth volume transition in piano roll, you'd have to draw a line, which would then become a whole bunch of incremental volume events. If you need to edit them later, you may have to edit each one separately or draw a new line.

Node based controls are point-to-point splining. A smooth fade could be accomplished with one click, placing a single node (point) wherever you want the volume to end up. Then the DAW interpolates the distance between nodes in X and Y axes and gives you a smooth transition between nodes.

Nodes are easy to use because they require fewer moves to create them and less work to edit them. For example, if you want to change the rate of volume change, just drag the one node to a new location. And you can very easily locate your destination on a precise value (as opposed to drawing a line with a mouse, a skill I do not possess.)

I like RBs piano roll; but I will say that node based envelopes are easy to use and easy to like

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0