I feel as if late-game scouting needs some kind of overwork. Once there are behemoth spitters and biters everywhere scouting becomes a real hassle because even with armor full of shield modules and exoskeletons you can't simply run around them anymore.
Currently I'm bringing lots of nukes but I don ...

Sometimes* splitters will prefer the left input belt over the other even if both are fully compressed same-type belts.

Here is an example screenshot. All four belts were started with full chests at the exact same time. After a while the two "left side" chests are already empty while the other two ...

Here you go: All four chests started full at the exact same time. The second and fourth from the top emptied exactly in the same moment. The other two have each 2.3k left. That big a discrepancy surprises even me. And evidently it also happens when the lanes are perfectly balanced.

EDIT: ok now I ...

Here's a version with the output side mirrored. Still the bottom input belt draws faster. I'll do a version without circuits next.

It is the individual lanes though. The splitter works per lane for each belt, and the splitter does not swap the lanes of the items. Your test is fundamentally flawed, it only proves that stack inserters move more items per minute than fast inserters.

Still doesn't offer an explanation. Why ...

Please notice that this is only about balance between the two input belts, not between individual lanes.
@orzelek I think that is a lane balancer.

I think you are going to lose against Game Of Life. That is unless you start listing HD graphics

Barrel and unbarrel again, that way you can filter for one specific fluid.

Couldn't you just activate the backup once your batteries drop to say 2%?

Well, measuring like this with one belt segment won't be accurate. One belt tile holds a fractional ammount of items. (7.111 items/tile). Depending on circuit network timings, this could significantly alter your readings.
I don't think so because it's measuring in pulse mode. Also as joonnnyy ...

Can someone explain to me the splitter behavior in my experiment?
The splitter in the center is the one I'm interested in. The left side is just a random setup to produce uneven demand.
The arithmetic combinators on the right side count the total number of items transported on each belt.The constant ...

Something seems to be broken about the new inserter behavior. If you wire an inserter to a chest and set its condition to "Everything = 0" then it should be logically evident that the inserter can never take an item from the chest. Nevertheless when you put something in the chest, it will get ...

Something seems to be broken about the new inserter behavior. If you wire an inserter to a chest and set its condition to "Everything = 0" then it should be logically evident that the inserter can never take an item from the chest. Nevertheless when you put something in the chest, it will get ...

Something seems to be broken about the new inserter behavior. If you wire an inserter to a chest and set its condition to "Everything = 0" then it should be logically evident that the inserter can never take an item from the chest. Nevertheless when you put something in the chest, it will get picked ...