I agree, in a general sense, that dating "dumb" women is a bad idea. By "dumb, I mean women with a significantly below average intelligence. Dumb people tend to make bad decisions that get them in trouble. This, in turn, affects the people around them.
However, after a certain point, intelligence in a woman is no longer a "value added" component. A woman with an Einstein level of intelligence is not going to make you happier than a woman of average intelligence. A high level of intelligence can also be a bad thing if she possesses certain negative traits. For example, narcissism, manipulativeness AND intelligence are a very dangerous combination in a woman.
Intelligence levels, advanced degrees, career achievements, and income thresholds are rarely value additions for women.
I could make the case that going from an 80 IQ woman (below average) to a 100 IQ woman (average) could be a benefit in terms of a quality girlfriend. I could make the case going from a high school diploma/GED woman to a useful trade certification/bachelor's degree from a mediocre university could be a benefit in terms of a quality girlfriend. I can't make the case that going from an average to above average IQ woman is beneficial in finding a good girlfriend. Getting a woman with a degree any higher than a BA/BS degree from a mediocre university is more likely to lead to a frustrating dating experience.
I actually have had more aggravation from dating smart women than "dumb" women. Dumb women are fine if they are willing to be led (and agree with you that typically they are more willing to be led and assume a submissive role than a "smart" woman who thinks she should be in charge). The problem arises if they actually have a true mental disorder like borderline, narcissism, etc. That is technically independent of whether a woman is "smart" vs. "dumb." It can inflict both.
Agree that mental health is a better indicator of relational quality than IQ.
Women with slightly above average to above average (not genius level) intelligence levels are some of the worst girlfriend prospects out there.
These are the women whose highest level of education completed are:
1. BA/BS degrees from elite private universities
or
2. Some post graduate degree (PhD, JD, MD, MBA, MA/MS)
There are a whole battery of problems with women in categories 1 and 2 above. Lots of SJW/careerism/feminism in those groups.
The best girlfriends are the ones who don't have a bachelor's degree but received a useful trade certification. If you must date a woman with a bachelor's degree, look for one who got a degree at a basic public university and who doesn't obsess over her career. STEM major graduates from public universities are odd women too. Most of those women will be careerists, so that'll eliminate them.
It's difficult to date women with just a high school diploma/GED. The upside in this group is that you don't get career obsessed women. The downside is that they tend to have messy personal lives. They tend to be undependable. As of 2016, the average woman without a bachelor's degree gives birth at is 23.8 years old.
Family life looks very different across the country, depending when women first give birth.
www.nytimes.com
More than half (54%) of mothers near the end of their childbearing years with at least a master’s degree had their first child after their 20s. In fact, one-fifth didn’t become mothers until they were at least 35. Some 28% became moms in their late 20s, and 18% had children earlier in their lives.
www.pewresearch.org