What's the difference between Yours and original authors?

First, it's an update to 0.16, the original author has not yet updated his mod to 0.16.
Secondly, I built the mod dynamically, so that different mods are supported, eg. Bobs or 5dim or all mods that offer improved splinters.
Recently, I cleaned up the source code and replaced it with Factorio's enhancement.

I took a look at the source code and You are right. Well done!

Now you need to make a single splitter that works well, because one that's already made, has lot's of limitations.

all the time since i saw the FFF about the new filtering splitters with priorities that work only on entire belts (keeping left lane separate from right lane), i was dreaming that someone made a mod for a 1x1 sized lane splitter/balancer (or even that it would be a feature in vanilla) that does to lanes what the splitters do to belts: select priority for input lane, output lane (balancing lanes when no priority is specified), and allow filters (including a dummy filter like fish on an ore belt, to force everything to a single lane) ...

Uhm, i just tested both vanilla and these balanced splitters.
There appears to no difference at all, at the output boxes fed by one box with iron ore,
all was perfectly 50/50 with both types.