It feels to me like it's a coincidence of evolutionary pressures and timelines that humans evolved to a take-off level of intelligence before elephants or whales. Whales especially just haven't had the time, they are a much younger species/order than primates. If humpback whales had been contemporaneous with, say, australopithecus, who knows how things would have gone. And elephants maybe just didn't win the roll of the dice, it feels like there were some very pivotal moments of evolution where our ancestors were under tremendous pressure, where small populations and a tenuous grasp on species survival led to unique intellectual adaptations.

It would be fun to imagine a world where the Americas were just out of reach of human migration, but an elephant species on the continents developed speech and abstraction. In my mind it would be a smaller species of elephant, of which there were many, and who may have more need to take advantage of intelligence to prosper.

I also think about r- and K-selected species [1]; whether the survival of a species depends on the fitness of the individual or the fitness of the parent. Humans are incredible parents (being K-selected), and we preserve our line by preserving our children. We're physically decent I suppose, but definitely not as children. Whales are similar, with small numbers of children who require almost heroic parental effort to raise. Elephants are definitely on the same spectrum.

[1] https://www2.nau.edu/lrm22/lessons/r_and_k_selection/r_and_k...