"The last couple times I used my dental insurance website, it was completely not mobile responsive, requiring the old-school pinch zoom to even get to anything on the page." And yet you probably didn't change your dental insurance based on this, because most likely there are more important issues that matter (e.g. you are given a single option by your employer). This is exactly the reason why that company is not likely to fix it, because the lousy website's effect on their bottom line is nearly zero. (Note that I don't like this either)