If I had to guess why they might not let you customize it - the people who make the software don't know or don't care about the other way you want it - it add

If I had to guess why they might not let you customize it - the people who make the software don't know or don't care about the other way you want it - it adds a bit more complexity / sometimes code debt to let that thing be customized - the design might be a specific way that they don't want to change