[2.0.33] casting-steel recipe incorrect?

[0n0w1c]

Maybe this is set for balancing purposes, but currently the casting-steel recipe requires 30 molten-iron, I expected it would require 50.
It seems the conversion is 10 molten-iron equals 1 iron-plate.

[tinker9]

There's a whole wiki section about the efficiency of the alternative Foundry recipes:
https://wiki.factorio.com/Foundry#Efficiency

I'm not a dev, but changing this balance would break factories.

[boskid]

Not a bug.

Some foundry recipes were balanced to compensate for lost productivity step compared to casting plates and then smelting them into steel.