What exactly is the difference between Bfa-style MMO and Diablo 3-style ARPG?

[Elias01]

Difficulty has been seen as different content in games since difficulty levels were introduced in the 1980s. Only idiots on here try the whole "difficulty is not content." when they cry about wow.

No they were not.

[Zephriel]

WoW is a group based ARPG and D3 is a solo ARPG. WoW is NOT a traditional MMORPG. They removed all the "massive multiplayer" things out of the game. Loot is personal, loot is easy to get, loot is 100% RNG based, the world does not matter, mobs scale. Gear falls from the sky. You can get the best gear in the game by playing with 5 people at the most. Raiding is purely optional, crafting is pointless, zero player interaction is needed to complete the game.