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"So I never said these are my problems -- these are simply the complaints I've heard from my married friends who have had children."
Well, you sure implied that these are your problems. If you're complaining on behalf of your married friends, do you want real solutions for them or do you simply want to keep complaining?
There are some real, concrete, practical steps that can be taken to address the problems you've identified. Exhaustion and/or depression and/or isolation are serious but common postpartum problems for new mothers and, by extension, their loved ones. It's common for exhausted and/or depressed people to lose interest in physical upkeep, for example.
If you're really interested in helping out your buddies, if their problems are really serious, you might look on their behalf into the many practical solutions that have been suggested. That's more productive than aiming missives at women in general.
-- another mom