I don't think NorthYYY knows what kind of filter I use so it's a false alarm. It's just a filter for one specific item, nothing more. The only reasonable way to filter multiple items is with hopper minecarts (with only a low amount of items to filter). Hoppers are changed in the way that they sometimes skip out on a hopper below and move items in the direction it goes. This is unlike vanilla Minecraft.
Rotten flesh can be used too breed wolfes. and to make the baby wolfes grow up faster. so no support on removing it completely. its easy to obtain and could be helpful for people with less grass so they dont have to use their actual food or bone supply.