Practical reasons insofar as your willingness to teach at a community college (be it TT or adjunct), your ability to teach in other disciplines (if your work is interdisciplinary), or the financial feasibility for you not to work within academia at all after getting the degree. While the job market is horrid, I think there are certain factors that might make *an attempt* more feasible than others. I think the idealistic *and* the practical reasons for doing so need to be present.
Flexibility in terms of childcare can be a huge perk and in some regards having children can give you an edge academically. My time management skills are leaps and bounds better than my peers without children. When I sit down to work, that is precisely what I do. I also think my skills in assuring accessibility of concepts and material within my intro courses is a product of being a parent. That's not to say that one is unable to adopt certain pedagogical approaches if they are without children, but in my experience it can help.
Full disclosure: I have no debt from my undergrad and graduate degrees and neither does my partner, so our financial obligations are extremely unusual for a couple with multiple degrees. If I weren't pursuing a life in academia, I probably would be a stay-at-home parent so the risk of not having a job when all is said and done isn't a huge factor. I also would be a potential candidate for a job in a few other disciplines outside of philosophy. If things were different for me, I'm not sure I would be going into a program in the fall. I might have waited a few years once the kids got a little bit older. (One is in second grade and it is actually quite delightful talking with her about my work and philosophical ideas in general. Also reading philosophical texts (especially Hegel, Marx, and Derrida) to a toddler makes for a good time. In such moments, the fact that I often burn my candle from both sides seems to be insignificant and my tenacity becomes renewed).