One pragmatic response is to avoid roles that feed into the stereotype.
You make a good point, and I agree with the pragmatism of the choice, but I also believe mentorship can be a means of advancement.
The point of my original comment was to advocate for another choice - one that will both advance the mentor and their proteges. Hopefully, this will give us that better world we're looking for.
But the 'den mother' comment comes out of a real issue, of womens roles being sidelined. One pragmatic response is to avoid roles that feed into the stereotype.
In a better world, this would not be a thing. But here we are.