Ahem. You’ve never had my apple pie.
That, and cakes are rather limited in scope — they’re all going to be made of some kind of baked mixture of flour, sugar, eggs, and assorted stuff. They can be wonderful…
…but they’re still limited to just that.
Whereas pies can be made of doggone near anything, from fruit to pudding to several different kinds of squash to mincemeat to any kind of socially-acceptable meat you care to name e.g. shepherd’s pies and Australian meat pies.
And as if all that weren’t enough, shoving a pie in someone else’s face is easier to do than with a cake.
Best of all, it teaches geometry. My youngest son was born 3 lbs, 14 oz, on March 14th. In case you didn’t get it, that’s 3’14” on 3/14 (and no, I’m not making that up). So for his next birthday, I’ll give him a pie in a square deep dish set on top of a large round plate. Why? Because you have to know pie are squared to get the circumference of the plate.
You simply can’t do that with a cake.