I don't really use Unity any more, as I have moved onto Godot for 3D, but I do keep up with the general news and forums. My impression is that Unity is developing at a very slow rate and yes, they definitely should have incorporated a visual event system by now, but I wouldn't hold your breath. Playmaker has been the best selling asset for a long while, so it is amazing they didn't hire Hutong to create it natively for them like they did with the developer of NGui (for the new GUI system).
If you want to see fast development, then check out the progress of UE4....wow that is moving at an insanely fast rate that is helped by having a pseudo open source model with community code contributions, as well as it being the inhouse engine for Epic. At this rate Unity will most likely always be playing catchup. Also keep an eye on Godot, as it is growing fast and will be very competitive to Unity in coming years. Also watchout Gamemaker, as Godot's 2d is very powerful as well. Currently no visual scripting so C2 has nothing to fear