What is so hard about letting the app users decide at what point the app will trigger an alert? I suppose you give it a default setting and if the user decides

What is so hard about letting the app users decide at what point the app will trigger an alert? I suppose you give it a default setting and if the user decides that the alarms are too intrusive then the users can change them. That's my quick thought. My point is that there should not be one setting for all users there should be ways to customize it. My guess is that it would only take a small bit of code to let the users adjust the setting.