I’ve heard multiple times that it’s not okay to allow any food to go down the drain even with a garbage disposal, I guess because solids shouldn’t go down the drain. But we put a shit ton of solids down the drain through the toilet and that seems to be fine. Does the toilet go to a different sewage pipe then the sink? Or does shit have different properties that make it dissolve better?
Aside from what others have pointed out about solubility, sink drains, as I understand it, have a narrower pipe than toilet drains do, though once it gets out of the house it all goes through the same pipe either way, but I think that’s a larger pipe than what’s in the house.