Flattening doesn’t necessarily “squeeze the juice out of them” if they are flattered while still raw. Grab a hunk of raw hamburger. Now squeeze. Did you see juice come out of it? Nope. It only squeezes out the juice if it has cooked to some degree and the fat has started to melt.
I like the thin, crisp edged burgers like many greasy spoons and diners served for many years. The one on the front page today from The Workingman’s Friend looks great! (Though toasting the roll would make it better. )