Me and some players from Project Ozone Lite would like to have enabled the ender io conduits with iron chests because its really usefull and i dont any problem in having this disabled since there are more conduits that lagg even more than ender io. I mean like it shouldnt be disabled because sometimes like for a mob farm you need to have a big inventory to store all your items and transfer them to your System or something for example. So please enable this feature because it really helps A LOT and makes the gameplay way more smooth.
back when i played that pack i used RFtools Modular storage instead. Final tier has 300 slots i believe with a build in crafting bench and you can transfer all items by removing the storage module. Much much better than iron chests.
The enderio conduits were disabled due to performance issues. While on their own they maybe ok, though still a bit heavy, when they're used in things like the mob farm you describe they can quickly back up. This causes them to continue to ask the chest "hey do you have room yet?". It gets worse over time the more backed up they get.