If you happened to like one of your test bakings particularly then you couldn’t reproduce it as accurately unless your method is consistent enough. So you wouldn’t benefit that much if the test was success, I suppose. But I don’t really do much baking so I don’t know how difficult it is to get it right and how much it matters.
Yes it does. I think it’s that way because it’s in locative case even though it doesn’t make the word itself look any different. English sort of has cases and doesn’t.
It works similarly in Latin. You don’t say ad domum. You only say domum.