You can argue semantics like this but you’re still side-stepping the fact that we had BoD and Crucible between Uldir and Eternal Palace.
Count number of bosses or nitpick at the definition of “raid tier” but the fact is that no expansion has had this much of a drought this soon after expansion launch.
If you want to say, “but Uldir was the first tier,” to that I say, that means BFA’s 2nd tier was underway by this point. If you want to say, “one raid tier is equal to another,” to that I say, you’re saying 1 raid = 1 tier, which is just weird when accounting for patch cycles and the first few months of every other expansion that has come and gone.
By this point in every other expansion we had major content updates with new stuff to do. That’s my point. You can say that Uldir is comparable to Castle Nathria, and you’d be right…but Uldir had BoD and Crucible of Storms coming out soon after it. The circumstances are not at all comparable.