I think some things have changed as time and the demographic have changed...when I first came on Mumsnet it was very much full of very educated, reasonably well off women- cleaners, Boden, degrees- as you might expect from people with easy access to the internet when it was often stilll dial up, on a site started by a (guardian?) journalist in London.
So, like thecatfromjapan, a lot of people will have been at uni in the 80s and possibly been quite feminist, and had to cook from scratch as ready meals and jars barely existed!
And now their children are often grown up so users are likely to be younger, and the site is bigger, and everyone has the internet, and people's experiences are different.
At one point there were a lot of parentsnof children with SN, probably because they aren't often stuck at home, and it was really useful and supportive- now to me that seems to be less the case, but as a pp said there are lots of people with anxiety, poss for similar reasons.
So mumsnet culture has changed, the real world changes, we see more variety of users (I hope!). But there is the risk of it all tending towards the lowest common denominator, and the good stuff getting lost in the noise.