What bothers me the most is the lack of attributes and resistances
Diablo
ALWAYS was more simplistic than the other games of the same age. On 90s, compare Diablo 1 with Ultima, Might & Magic, etc. On earlier 00s, compare Diablo 2 with Morrowind, Gothic, etc. That said, the huge decline of Diablo 3 was a reflection of the late 00s , other games dumbed down/declined too in that time. Sacred 3, Elder Scrolls, Gothic 4 Arcania, etc. That said, there are no way that a AAA game will be inclined to earlier 00s. I was not expecting a Souls like attribute system but at least 3 attributes, STR, ENERGY and DEX should exist and they should affect more things, eg, STR gives fire, cold resist, increased crushing blows chance, increased melee damage(applies to werewolf druid) etc, DEX gives projectile speed(applies to bone spear), running speed, rate of fire with ranged weapons and lightning resistance, ENERGY gives %damage goes to mana, raw magical damage resist, increased spell damage, ec
About resistances, i would love to see then back not as percentage, but as a flat amount. Eg, a imp has 40 fire resist and 0 cold resist, a 50 damage frost bolt will deal 50 damage and a 50 damage flame arrow will deal 10 damage.
It makes much more sense IMO than any weak fire being able to damage a Pit Fiend...