Other forces are to blame as well, though. In the 80s and 90s there were UI research labs in indistry that did structured testing of user interactions, measuring how well untutored users could accomplish assigned tasks with one UI design versus another, and there were UI-design teams that used the quantitative results of such tests to deign UIs that were demonstrably easier to learn and use.
I don't know whether anyone is doing this anymore, for reasons I'll metion below.
Designing for use is one thing. Designing for sales is another. For sales you want a UI to be visually appealing and approachable. You probably also want it to make the brand memorable.
For actual use you want to hit a different set of marks: you want it to be easy to learn. You want it to be easy to gradually discover and adopt more advanced features, and easy to adapt it to your preferred and developing workflow.
None of these qualities is something that you can notice in the first couple of minutes of interacting with a UI. They require extended use and familiarization before you even know whether they exist, much less how well designed they are.
I think that there has been a general movement away from design for use and toward a design for sales. I think that's perfectly understandable, but tragic. Understandable because if something doesn't sell then it doesn't matter what its features are. Tragic because optimizing for sales doesn't necessarily make a product better for use.
