Ciel
in essence
Well, to answer your question while keeping nominally within topic: relate the pastry making process to the original point of insisting on 'purely original teachings.' Pastry does not respond well to heavy-handed authority.
Baking powder and baking soda forcefully separates the flour apart, whereas when you mingle the fat with the flour, without forcefully homogenizing it, (i.e. cutting the fat into pea-sized chunks and lightly mingling it with the flour before adding the water,) and then with the lightest touch possible, rolling out and shaping the pastry, you will achieve flakiness when the pastry is heated and the fat melts, the fat will migrate towards the flour of its own accord, leaving the space one occupied by the fat empty, thus achieving a natural flakiness in an elegant and non-forceful manner.
Forced homogenization via rough handling toughens the pastry, and more rough action would be required to force the homogenized dough apart via baking powder or baking soda to achieve 'flakiness.' That would be analogous to the rough handling of Buddhism by forcing all the different schools of Buddhism to stick solely to 'the original teachings presented to those 'authorative' people so long ago, instead of adapting them to naturally work with each person.
Beautiful well founded description Seattlegal,
Good cooks sure have a way with words.
- c -