Permissibility of combining prayers as a resident

The Messenger of Allah ﷺ combined Ẓuhr and ʿAsr ˹prayers˺ and the Maghrib and Isha ˹prayers˺ in Madinah without being in a state of fear, nor due to rain. It was asked of Ibn ʿAbbās: What did he intend by that?. He said: He wanted that his Ummah does not experience any hardship.  

جَمَعَ رَسُولُ اللَّهِ ﷺ بَيْنَ الظُّهْرِ وَالْعَصْرِ وَبَيْنَ الْمَغْرِبِ وَالْعِشَاءِ بِالْمَدِينَةِ مِنْ غَيْرِ خَوْفٍ وَلاَ مَطَرٍ۔ قَالَ: فَقِيلَ لاِبْنِ عَبَّاسٍ مَا أَرَادَ بِذَلِكَ؟ قَالَ: أَرَادَ أَنْ لاَ يُحْرِجَ أُمَّتَهُ۔  

the Prophet said: "Whoever combines two prayers without any excuse then he has committed something from the major sins."  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ جَمَعَ بَيْنَ الصَّلاَتَيْنِ مِنْ غَيْرِ عُذْرٍ فَقَدْ أَتَى بَابًا مِنْ أَبْوَابِ الْكَبَائِرِ