Try this: make two mini pies. One with Granny Smith. One with Gala.
Bake them side-by-side. Taste them blindfolded. Be a scientist for ten minutes.
You’ll notice the Gala pie is juicier but not watery. It’s like the apple released its tears of joy into the filling.
It also sets up faster. You won’t have a runny pie that floods your plate.