Why do you have to let steam out of pies?!

Best Answer - Chosen by Voters

I think it's so the steam can escape from inside the pie and so doesn't make it all soggy and flat. Making a few little cuts on the top does the same trick.

If you don't provide an outlet for the steam that will build up under the crust, it will forcefully find one eventually by sheer science but it may blow your filling out with it.....

cooking experience

if you don't let the steam escape your pie could explode
Putting a hole in the middle with a knife does the same -lets out excess steam

So that the crust doesn't get mushy or billow up and fall apart.

Nom nom nom

b/c then it might explode creating a mess or the insides would burn or when you cut the pie you might get steam burns