When you consider that marketing is intended to manipulate consumers into thinking they want your product, it's more about convincing people that your product has value, and that they need it, rather than selling something that consumers actually need.

Look up manufactured scarcity. Great way to make money for shareholders without providing more to consumers. You charge them more for less. Notice any of that recently? Notice any record breaking profits in any industries? Notice any shortages of important things like IDK ... housing?!?!

I'll also give you another example of capitalists not giving a fuck about what consumers want: electric cars back in the 1990s. The auto manufacturers realized they would lose their parts and repair businesses, as electric vehicles have fewer moving parts, the oil companies got pissed, so they put some power together and used the federal government to overturn californias electric car act that consumers voted for. The also forcefully recalled electric cars from consumers and crushed them. They did not care if there was demand if they could make more money in the short term by staying the same.

Hell, the very existence of exxon mobile disproves your ideas that companies will innovate in response to demand because they spent their money lying to the public about climate change so they could avoid any innovation at all for as long as possible. So WTF do you mean they care about demand?

Your logic that capitalists only do what consumers want is whats basic and flawed. If thats true, WTF is advertising? You think it's just a fun hobby that doesn't work? If advertising doesn't create false demand, why do it? We have evidence advertising creates demand, therefore advertising works, therefore you need to adjust your worldview to allow for the fact that some amount of the shit that consumers buy is nothing more than light brainwashing. Including you dear.