UE BPs do have a few abstractions available-- macros, interfaces, classes, data-only. [1]

I think the greatest challenge of VPLs is how they don't have an inherent linear structure, so reading and understanding them for modification requires a nonlinear scan of a node soup. This puts them in the class of tools that struggle to make large programs readable, like Bash or Forth.

https://dev.epicgames.com/documentation/en-us/unreal-engine/...