That's simply not the experience of the vast, vast majority of users. That the market doesn't bend over backwards so you won't have to spend $10 on a USB ethern

That's simply not the experience of the vast, vast majority of users. That the market doesn't bend over backwards so you won't have to spend $10 on a USB ethernet adapter is neither dumb nor anti-consumer, it's perfectly rational. Especially on recent generations of laptops that are literally thinner than an ethernet socket.