You are right. Also take a look at the development of tablets.

In the beginning they were small low-res tablets. But people wanted a bigger screen -> bigger tablets with high-res screens. But people hated to type on the screen -> keyboards added. But people hated to hold it all the time -> stands are added. And suddenly it is looking like a laptop.

I think there is a reason why Laptops and Desktops didn't change that much in all those years.