Do you not agree that Allah Almighty's saying: "And whoever is ill or on a journey, then [he must make up] an equal number of other days" came unrestricted, and that the sick person has the concession to break their fast, just like the traveler, without being restricted by a doctor's recommendation, as a mercy from Allah and a removal of hardship?

The questioner's opinion contradicts that of the majority of scholars. The illness that permits breaking the fast is one that is worsened by fasting or whose recovery is delayed by it, and which causes hardship for the fasting person. Ibn Qudamah argued for the majority's view by stating that a sick person who is not harmed by fasting is obligated to fast, just like a healthy person. Furthermore, the presumption (mazinnah) in travel is long travel, where hardship is considered. However, in illness, not all illness can be considered a presumption; rather, the criterion is the actual harm caused by fasting.