One example is the lore for Demons being immortal outside of the Twisting Nether.
Not correct. It is mentioned in the WC3 storylines that demons never truley die but it’s not explained on how it works exactly.
WoW also made Kael’thas into a bad guy,
Wrong. He became a villain once he joined Illidan and then helped him when he was ordered by the Burning Legion to destroy the Lich King.
Forsaken and Blood Elves join the Horde
The Horde is a ragtag group of outcasts - of course they would join.
bridged a connection between the Eredar and Draenei
“Oh no they dared to make the Draenei more interesting! How cruel of them!”
Also Druids opening up to females
So you want an MMORPG where one gender can’t play a certain class? Yeah like that’s going to work out for Blizzard.
Druidism being exclusive to Night Elf
Well they tried that in Classic WoW with Paladins and Shamans and people were outraged on both sides since the other was always the “OP” one. Besides that - Tauren and Nightelves have a very similar culture and connection to nature. Plus the two races have been allies for a while. It makes sence that they would work together and learn from one another.