I know it is popular, but that does not really mean it is also better. I totally think that vertical graphs are quite unreadable especially when it comes down to connecting output values to input parameters or even when there is multiple branching going on. FlowCanvas will remain horizontal by choice because I honestly think horizontal is better in many respects, and unlike some other devs I don’t really like copying things all over but rather have my own vision for the software 🙂
Im the same opinion like Gavalakis. The effort would be to much but the bonus to small to implement such a feature. And if Unreal User are switching to Unity they will be happy to get a VS which is familar and fully featured like flowCanvas is.