Three-finger drag gestures working sporadically on 2016 MacBook Pros, users say
Some buyers of Apple's new MacBook Pros are finding that the three-finger drag gesture is working inconsistently on their trackpads, if at all, according to complaints on Apple's support forums and elsewhere.

Where the problem is intermittent, it may manifest only on some parts of the trackpad. Some owners, including people on MacRumors forums, have speculated that the issue is related to palm rejection technology.
Either way it's unclear if the issue is a hardware or software defect, and Apple hasn't officially acknowledged the situation. Both 13- and 15-inch systems are being impacted.
Three-finger drag is available with OS X Yosemite or later, and can be used to reposition windows without moving the mouse cursor and clicking. It can be toggled through OS X/macOS's trackpad settings, located under the Accessibility section of System Preferences.

Where the problem is intermittent, it may manifest only on some parts of the trackpad. Some owners, including people on MacRumors forums, have speculated that the issue is related to palm rejection technology.
Either way it's unclear if the issue is a hardware or software defect, and Apple hasn't officially acknowledged the situation. Both 13- and 15-inch systems are being impacted.
Three-finger drag is available with OS X Yosemite or later, and can be used to reposition windows without moving the mouse cursor and clicking. It can be toggled through OS X/macOS's trackpad settings, located under the Accessibility section of System Preferences.
Comments
That rumour may result from the confusion between three finger drag and three finger swipe. These are not the same. Three finger drag is an accessibility option. If one has some weakness in fingers and dragging with one finger is troublesome for example, the three finger drag may help. Do not use three finger drag to switch between applications, this is not how it is used. Three finger drag is when dragging a window or an icon, three finger swipe is when switching between applications.
I don't have that machine so I cannot say anything further regarding the existence of the malfunction.
I used to have a touch screen hackintosh some years ago but it was a small computer in terms of power, so yes it works on OS X and they could implement it easly especially on these powerful machines now. It works great at 2732 x 2048 on iPad pro 12" on an inferior software and processor.