1. Normal only character mode. No Nightmare, no hell. The best time of resurrected imo was the Beta with only A1 and A2 available, when items like spirit and SOJ was possible but really hard to get.
2. -100% xp gained, 20life small charm. Allows twinking for pvm.
3. Requirements reduced affixes effects level required. Tyrels might have a purpose without changing it. New possible low lvl setups.
4. Cross play. Diablo 2 is the perfect console game, but the community aspect is missing.