Maybe? And to be fair, I didn't watch the video. My thought process was that folks should be able to find "home" on the keyboard easily enough, if they're proficient, and backlit keys should be plenty adequate for any sort of hen-pecking or key seeking that needs to be done for the less-used key.The implication from the video was that it would enhance the backlighting effect of the keys—i.e., for working in dark environments. It is true that the current version leaks quite a bit of light around the keys. I'm not so sure that's a bad thing, but either way it's my understanding that this is the motivation for the black background.
I have an aging MacBook Air which I use for astrophotography. That's about as low-light as it can get. And I do hen-peck at that keyboard because I'm just tapping a key here or there rather than touch typing. Even in that case, the light that protrudes around the keys isn't really doing me any favors. I'd rather just see the backlit glyphs. But it's also not really slowing me down or bothering me.
Really I'm just kind of marveling at how some people have strong opinions about this. It's like they don't really use their computers and keyboards all that much. Someone just likes the aluminum accents? Sure, that's a style thing. But how on earth is it impacting their ability to use the computer...
I'm happy for full-size keys, and good key travel. And I'm hopeful it is a great design given Apple has already backpedaled from the iffy keyboard design they used for several years of the MacBook Pro. It seems like this model represents an extent of de-Iveing of the MacBook Pro. A lot of style concern has shifted back to genuine functionality and usability without walking away from the broader design language.