It's not so much unfair as...perplexing. The article seems to imply that women will be happier placing more emphasis on family, but at the moment the mean-time-working-women-spend-with-their-families is greater than mean-time-working-men-spend-with-their-families; stay-at-home moms outnumber stay-at-home dads by approximately a bajillion to one.
In other words, if there is a bunch of free happiness to be gained by emphasizing family more, addressing that advice to women _in particular_ seems...inefficient.
In other words, if there is a bunch of free happiness to be gained by emphasizing family more, addressing that advice to women _in particular_ seems...inefficient.