[Machine] To sit comfortably in prayer was supported by Al-Shafi'i in his book "Ali" and Abdullah without any conditions. He said that what Ibn Mas'ud dislikes, which is a man sitting during prayer, is disliked by the people of Iraq who disagree with Ibn Mas'ud. They say that the sitting position during prayer is a form of sitting. Then, in the book of Al-Buwayti, he said that one should sit in the position of standing while being comfortably seated. And how is it possible? It seems that he specifically highlighted this or reached it based on some previous evidence. And Allah knows best.  

أَنْ أَقْعُدَ مُتَرَبِّعًا فِي الصَّلَاةِ وَهَذَا قَدْ حَمَلَهُ الشَّافِعِيُّ فِي كِتَابِ عَلِيٍّ وَعَبْدِ اللهِ عَلَى الْإِطْلَاقِ وَقَالَ يُكْرَهُ مَا يَكْرَهُ ابْنُ مَسْعُودٍ مِنْ تَرَبُّعِ الرَّجُلِ فِي الصَّلَاةِ وَهُمْ يَعْنِي الْعِرَاقِيِّينَ يُخَالِفُونَ ابْنَ مَسْعُودٍ وَيَقُولُونَ قِيَامُ صَلَاةِ الْجَالِسِ التَّرَبُّعُ ثُمَّ فِي كِتَابِ الْبُوَيْطِيِّ قَالَ يَقْعُدُ فِي مَوْضِعِ الْقِيَامِ مُتَرَبِّعًا وَكَيْفَ أَمْكَنَهُ وَكَأَنَّهُ حَمَلَهُ عَلَى الْخُصُوصِ أَوْ ذَهَبَ إِلَيْهِ بِبَعْضِ مَا مَضَى وَاللهُ أَعْلَمُ