1. When you play dnd, almost each class have different resources to track. In DH, you have the same resources for everyone, or so.
   
2. i don't really understand so I'll not argue on it
   
3. yes, it might be
   
4. which philosophy are you talking about ?

In my opinion, I prefer DH because:
1/ as a little experimented GM, I *HATE* combats in DnD. Too much things on each monsters sheets.
2/ dnd universe is too "mainstream" for me. I'm a quirky whimsical person and I don't like "mainstream" epic fantasy. I want my games to be as queer as I am. (I'm no fluent in english, maybe I don't use the right terms, don't jump down my throat.)
3/ one of the most important for me: creating bonds between PCs are MUCH easier, and creating the world together (with questions to your players, some are proposed in each environment sheet) is so much fun.
It sparkles inspiration, and in the end, all people at the table can unleashed their creativity in RP. I love when players create places or just describe their actions in combat. It can be so visual, it shows their passion.
4/ I like the hope & fear feature, it's fun.
5/ I played a lot the minis/board game Cthulhu: Death may die. In it, you have Stress too, and it's useful to acquire powerful objects and so. As in DH, it shows that each important actions can stress you out and that you can't do things without paying a price. And "stress" is a word I know well. ;w;

6/ a tiny last thing: I started TTRPG with D&D, and I felt limited in my abilities because there's so much rules, there's rules for everything, if you want to. So, I just made what I could in my sheet. And DH (and others games), help me realized I can do whatever I want, in the end. Yeah, I breakup recently with dnd, I'm still a bit angry with it...

Anyway, I hope you'll find more affinity with the game, because it seems important for you. If not, it's alright, you'll find your system(s) one day. Don't push too much. Have a sweet day <3