It’s nice when things past generations did can be considered a hack now! I am not being sarcastic, there are definitely things people have stopped doing that work just like there are things we stopped for a reason. I definitely did not know how much apples can help with other things!
it sometimes leaves a bit of the egg white. and if you need only egg yolks for baking without any additions, those small amounts can spoil the final product
I usually do it when mm asks me to help with cooking, and she never complained before, so..