To the contrary, it is a lot easier to move your finger forward 3 inches from your laptop keyboard and touch a screen element instead of moving it back 3 inches, moving the cursor using a trackpad to the element and then clicking.
If you have fingers that can reach, from the keyboard up to the top of a screen, perhaps 8" away from where your fingers are, you're likely from another solar system, because as I type this, the only thing I, and any normal human being, could do on screen would be touching the lower ¼ of the screen.
In fact, I'm typing on my 15" rMBP and I would not only have to reach forward to get to the screen, but would then need to lift one or both arms up in the vertical plane in order to touch the screen. Which, by the way, I absolutely do not want to touch the screen with my fingers, as it gets dirty enough just with airborne dust and contaminants, I don't want hand oil on the screen too. And I am sure I'm not alone in this concern.
And even if you are an extraterrestrial, with extra-long fingers, the motion of touching the screen is still un-natural and requires more work than sliding your hands back 4" inches, within the same plane you're are typing, to the trackpad.
And don't forget, touching the screen also brings into play the issue of applying just the right amount of pressure to do what you want, but not to push too hard and move the screen. This alone, requires extra concentration, unless you hold the screen in place with one hand while doing whatever on-screen action you need to do. Or, the hinge needs to have significantly more resistance to keep it in place.
I watch the commercials pitching the convertible laptops, where they flip the keyboard around so it becomes the base and think, then your keyboard gets to pick up any desk dust, how great. All for the one or two times where you think that position makes more sense than simply using the laptop in the standard configuration.
So many companies build in "features" that are simply done because they can, without thinking through how the user would actually use the feature. Or maybe they absolutely understand they're simply throwing everything and kitchen sink into their devices hoping one or more unusual trait is enough to get people to buy the product.