My sister recently started making NY cheesecakes (Baked) according to an online recipe she found. I assisted her in doing so, and every time I mentioned any kind of change we could make in the recipe she refused to even think about that stating "you should be loyal to the recipe" and "don't make comments about things you don't know".
So I'm wondering: how much can I change a recipe for a different result?
Can I swap "petit beurre" biscuits with "digestive" biscuits?
Can I use any other kind of starch instead of corn starch?
In general, is it wrong to make drastic changes in a recipe?
P.S.: I am the kind of a person that tries different things to find the right way to do things, more of a trial and error kind but with the recent spike in the prices in my country and the economy we have I can't afford trying and failing no more, so I have to ask about everything beforehand, even the simplest things.