Making a bike more comfortable is something I think one thinks about only as you get older. Fenders, kickstand, comfortable upright position, step thru are all things I never even remotely thought of in my early days. Even a small basket to carry small items. They are huge things tho for comfort and ease.
Having had many mountain bikes and really prefer that base for a bike, brakes, tires, gearing , the change to upright gets tricky. Straight bars change to sweptback bars, stems are shorter and more upright, and since the bars are wider and wraparound some the cables are too short and need to be changed. All needed tho to really get to that comfy place in my book.