Hey there, thank you for the nice words!
You are correct that the vesta pipes make plasma ducts redundant and expensive. Iirc Blackheart initially had the plasma stuff planned for his shattered planet (which would've been fine) and then moved them to Vesta.
I initially wanted to fuse them into one entity when Vesta is installed especially since the Vesta pipes look quite nice but got the feedback on discord that people preferred the look of the plasma ducts.
As it stands right now, plasma ducts have some pending changes including a complete reskin by an artist. I've played most planet mods but not Vesta so I think I'll come to a decision on this once I do. There is also a second planet mod in the works right now that will use plasma pipes, so that needs to be considered as well.
Currently, I think merging them and then letting the players pick the look in the options would be the best idea.
Thank you for your feedback!