Of course, explaining anything in detail is likely to make people think you work in the industry (I do not) and get accused of being a shill. All of which proves to me that older generations had a much easier life because nobody so financially ignorant today is in any sort of position to be able to buy a home.
All that said, I don't think it's actually a price ceiling. It's a limitation of what factors can be taken into account to set rates, and constitutional amendment from Prop 108 prevents the legislature from changing it.
In the many many complaints I have heard about the insurance industry, nobody has complained about them acting as an oligopoly or about a lack of competition.
Further, pricing is extremely regulated in terms of what can be factored in, so being an oligopoly doesn't have much impact on that.