Blues are MONSTERS now.
- Steel Plate - A small reprieve, this hasn't changed
- Smart Inserters - Requires a chain of Inserter-Fast Inserter-Smart Inserter still, with chips and such along every step. Still pretty big
- Advanced Electronic Circuits - Now require a full oil industry facility in order to produce the new plastic requirements, as well as the logistics routing
- Batteries - Even more complex setup than the new circuits, requiring three chained chem labs (Gas -> Sulfur->Sulfuric Acid->Batteries)
In addition to still requiring rocketry (instead of Advanced Electronics and Oil Processing 1), that's a lot of tech you gotta fill out between green and blue. Greens are easy. Running pipe, not so much.