There are short-term and long-term advantages and disadvantages, though.
From the article, it sounds like this may have protected them from human predation, but there may be significant long-term negative impacts on the species due to the lack of viable male offspring.
Survive more easily for a couple generations, but go extinct as an all-female species after a couple more...
> Survey data revealed tusk-inheritance patterns consistent with an X chromosome–linked dominant, male-lethal trait. Whole-genome scans implicated two candidate genes with known roles in mammalian tooth development (AMELX and MEP1a), including the formation of enamel, dentin, cementum, and the periodontium. One of these loci (AMELX) is associated with an X-linked dominant, male-lethal syndrome in humans that diminishes the growth of maxillary lateral incisors (homologous to elephant tusks).
Humans have near but exactly 1:1 ( 1.05-1.07 favoring males at birth ). Fisher's principle[1] explains why this 1:1 is common.
There is big imbalance problem for humans as well, many cultures prefer male children over females, the two largest countries - India and China have big imbalance for different reasons there is estimated 100 million less girls than boys in these two countries alone as result of sex selection/ infanticide etc .
From the article, it sounds like this may have protected them from human predation, but there may be significant long-term negative impacts on the species due to the lack of viable male offspring.
Survive more easily for a couple generations, but go extinct as an all-female species after a couple more...