im a factorio noob so just checking some intuitions

> Example of 4 x 4 naïve Throughput-Limited belt balancer. This is not what we want.

is this because a slowdown on belt #1 doesnt then get filled by belts 3 and 4? so this isn't a properly completely rebalancing system?

> 4 x 4 Throughput-Unlimited belt balancer. This is what we want.

but then this is weird too. the top left tunnel entrance thingy goes down and then immediately up again. why? maybe it tunnels all the way to the top right, in which case it has the same exact flaw as the first throughput limited example that we didnt want - belts 3 and 4 dont get to redistribute their stuff to it if belt 1 dies.