Much less of human errors, I suppose.
Probably just use "direct path", not avoiding obstacles, maybe with underground belts where necessary.
Might be convenient to allow NumPad+/- for increasing and decreasing width of the "combined" belt too.
Is it possible?
P.S. I mean something like this, but with belts:
![Image](https://eu5.factorio.com/assets//img/blog/fff-114-rail-building-manual.gif)