The modpack I've been playing with recently has 3 tiers of pipes, where each tier has a greater underground length and extent. Most of my pipelines are relatively short, but I have some pipes going across the base which connect various producers and consumers which are beyond the range of the lowest tier extent. Being able to upgrade them would be useful for merging different pipe sections into a single extent to make managing fluid levels more convenient, and it'd also help reduce clutter since I could remove many of the underground pipes afterward and make connection paths more direct.
