It’s in the territory of WoW urban legend/myth, though given the evidence we have seen, it could be dead accurate.
Team A - (Classic, TBC, WotLK, MoP and Legion) are objectively superior to Team B (Cataclysm, WoD, BFA) in terms of features, innovation, and quality.
Another way to look at it would be that the A team is the team that innovates the game; B team is the caretaker team: they simply maintain the game with filler expansions. It checks out - TBC, WotLK, MoP and Legion brought numerous features in the form of classes, professions, races and gameplay. Cata, WoD and BFA are sparse when it comes to this list, only have 1 or 2 features… and even the features (Garrisons, Azerite) don’t require constant balancing as a class would.
Warfronts and IF are scenarios that have been massively stripped down in variety, lore development, story progression, charm and soul.
TBH I am not sure why Islands and WFs were touted as new features for this expansion. We have literally seen them - the gameplay vehicle, that is - used to much better effect through out MoP and WoD.
I’ve ranted at length on General as to why WFs and Islands are probably some of the worst content in WoW from a gameplay perspective.
Pandaria felt like thousands of years of history actually happened and shaped the people and places across the continent. Only Northrend and Outland had the same feeling that the land itself was a character in the story.
The biggest fault of MoP is we spent too much time focused on the sub par war story and not the charismatic land of Pandaria.
I feel the Mogu, Pandaren, Mantid, and other races had a lot more to offer the story and overall lore. I would have loved a Youngol and Saurok raid going deeper into their story.
I also feel the Sha should have been a completely new foe with no ties to the old gods or titans. Too much is tied to these two forces and I was really intrigued with the Sha before we learned their origin.
Still MoP was amazing and a testament to what blizz can do if they really have a team with their heart and soul invested in creating something.