What is central to the second kind of concession described as permitted despite its ordinary cause?

Prescribed Acts and Prohibitions: Fard, Wajib, Sunnah, Nafl, Haram, Makruh, Azimah and Rukhsah

• Personal culinary preference
• Genuine need to preserve life under grave necessity or coercion
• Minor boredom with an otherwise lawful choice
• Using a prohibited item at all times for everyone