I need to do another vertical factory playthrough. That playthrough was a bit of a blueprint headache because no vertical splitters. Imagine a 5x5 grid (7x7 would've made it easier but IMO we unlock it way too late in the game for it to be useful in that playthrough) getting 4 inputs coming up from the bottom, rotating them to become horizontal, then splitting them so half of the 4 inputs could go into the manufacturer and the other half positioned in a way that when they get rotated back into vertical their output would align with the input. It was a mess, I nearly gave up.

And when you got the blueprint ready it was really annoying to connect the blueprints so hopefully the auto-connect solves the other issue I had with vertical builds.