Well, supposedly you like the logo of the product you buy, especially if it's tastefully done. No one tries to remove Lenovo from their thinkpad, right? The "Intel inside" and "AMD graphics" are crumby stickers your wrist can feel and add nothing to the design.
It doesn't glow any more on the newer models. Also there's a difference between a manufacturer's logo and stickers. You'd be hard-pressed to find a laptop that doesn't include the former.
As others have mentioned the new logos don't glow but even when they do glow the important thing is that it's on the back of the screen. So I as the user am not really aware of it when I'm working.
It's kind of a shame they've re-added the "MacBook Pro" text below the screen, I loved the debranded look of business end of a MacBook Pro.
On my late 2013 MacBook Pro the only Apple branding I can see is the small Apple in the menu bar. That's really cool.