This "look! new raids!" thing is getting repetitive. The game must evolve beyond this specific niche of group content, who is enjoyed by less than 25% of the playerbase (CHOZO, Bullshit Statistic, 2017).
I think what they'r doing with Warfront is a step in the right way. They looked into what made Warcraft, well, Warcraft - FACTIONS battling each other. Horde VS Alliance, Orgrimmar VS Murloc Tribe, Kul'tiras vs Terrors of the Deep, etc. Raids are weird, since they focus much more on a Boss, instead of the faction that the boss represents. The most important battles in Warcraft should involve you, as a Hero, with a army, against the enemie's Hero unit, and his army.
In the future, instead of a Raid Tier, we'll have a Warfront Tier. It will be awesome.