When loaders get elements by one, they utilize only one conveyor line.

[heckad]

It would be nice if they changed a line on each new element.

This is also true for loading items into a chest.

[ptx0]

that would probably require keeping track? you can use miniloader, they have many inserters. the inventory-inserter logic seems to balance the output.

[ssilk]

For me it’s an equivalent problem as with the inserters. I use this behavior for my advantage.