So the vast majority of home computers these days are towers it seems. But, remembering with some nostalgia, I rather liked the design of the old desktops like the Compaq Prolinea 433 and the Apple Macintosh IIsi. Whatever caused the old desktop designs to go out of fashion, and do you think they could ever make a comeback?
All-in-one desktops, powerful laptops and notebooks made desktops that were a bit cramped for extra drives redundant. That and flat screens. Who wants the footprint of a desktop taking up desk space? That said I don't think there is a shortage of desktop form-factor PCs still out there. They are "slim" towers now. Desktops flipped on their side.
I've never really looked all that closely at them - do they have feet on one of their sides to allow them to lay flat?
Some do. But even if you put it on the desk, coolness requires putting it on its side as a slim (mini) tower.