What is in the sandwich determines if you cut it diagonally. Tuna/chicken/egg salad sandwiches shouldn’t be cut diagonally because everything falls out.
If it’s a mostly wet filling like those you’e mentioned, the cut isn’t what’s making it fall out of the sandwich. Those tend to get pushed out the back and sides even without cutting it. Especially if it’s got a lot of if in there.
What is in the sandwich determines if you cut it diagonally. Tuna/chicken/egg salad sandwiches shouldn’t be cut diagonally because everything falls out.
If it’s a mostly wet filling like those you’e mentioned, the cut isn’t what’s making it fall out of the sandwich. Those tend to get pushed out the back and sides even without cutting it. Especially if it’s got a lot of if in there.