You sound really defensive about this stuff. Easy, there.
The fact that there are Gnolls, Tuskarr and Centaur is nice. But it's still 90% dragons. Most of the notable characters are dragons, most of the NPCs, guards, and even critters are either draconic or dragon-like. It's not bad per se, it's just not as down to earth or diverse as, say, Kalimdor or Eastern Kingdoms.
An additional problem is that most of this ties back to a few central themes, such as Tyr and the Titan lore surrounding him, the Primal Incarnates, the Dracthyr and Neltharion (including the Void), and so on. This is a step back towards normalcy from Shadowlands, which I appreciate. It is tangible. It's not just some "God did it" or "What is the nature of reality?" nonsense. But it's still not, y'know, Defias brotherhood attacking a village because they're upset with the Stormwind nobility, or some rogue Druid making a mess of a small cave somewhere in Feralas.
Exile's Reach did a great job at making a simple story pretty engaging without connecting it to the cosmos, all the while giving us a nice resolution. More of that, please.
As for the Primal Incarnates and their ultimate goals, I would argue few people know about what you just wrote. As soon as in May with the 10.1 trailer, I distinctly recalling people not feeling sure why they were going to Zarelek. The raid in 10.1 doesn't offer much in the way of closure, either.
Regarding your comments on using ground mounts, that's an old and rather poor argument to make. The zone and the flow of the quest content is designed with Dragonriding in mind. You probably technically can do much if not most of it by using regular mounts, but it won't feel like slowly ascending Kun-Lai Summit, as Blizzard haven't had to give much thought to the way in which the zone is presented to you.