Well, independent of it being a personal choice, I guess there are some questions we as a society need to answer: Do we want women to have children? Do we want to allow women with children to work? If yes, are we willing to make the changes that are necessary? If not, are we willing to support families so that there is no need to work? Doesn't it make sense to take the opportunity that knowledge workers get by using the internet to solve some of the challenges?
And maybe this doesn't need to be a privilege for mothers. Maybe everyone else can benefit from some flexibility if we don't set up our work around 9-5 presence. Who knows what other benefits this unlocks, even for work productivity.
By the way, I find it strange how someone hiring can go from 'you are exactly the person we have been looking for' to 'no interest' just because someone asks for some flexibility.