That is definitely not a typical toaster. Where are you buying your toasters from? I'm also in the US and have never seen one like this in my life. You can find a decent toaster anywhere, even at Walmart or something.

ETA: I skimmed through the first two videos you shared and these are standard toasters with heating elements on each side of each slot. I have the 4-slot version of the Walmart toaster in the second video and yes it has some unevenness in toasting but it always toasts both sides.

Sorry, I think people want to help, but I think you're a little confused about how toasters work.