How long did you try? Of course learning to touch type on a different layout will take some time but that doesn't make using brackets in programming languages unreasonable.

Using a German layout is very much a choice you have made and is no reason for you to demand that programming languages should make everyone else's life harder to acomodate those choices. Even for German text input, umlauts and sz are rare enough that it is not much of a hindrance to have to enter those via dead keys or compose sequences on a layout that doesn't make {} and [] a pain to type.