M.G. Siegler, writing for Medium:

As you undoubtedly know by now, one of the core bits of funtionality of Apple Watch revolves around Force Touch. That is, pushing the screen a bit harder than a regular tap in order to bring up a new set of options. Of all the unique features of Apple Watch, this is probably the most profound. It’s not exactly obvious at first, but once you get it, it’s a natural gesture.

And:

Force Touch also just came to the MacBook line as well. It’s interesting on the trackpads here (I’m typing on one right now), but I believe the technology will have a far greater impact on iOS devices because it’s such a natural way to extend the use of restricted touch-sensitive space.

And:

It’s interesting that Apple previewed the technology on the Apple Watch first. It also makes you wonder: if there was no Apple Watch, would Apple have come up with Force Touch at all? Sometimes form births new function.

Thoughtful piece, though I am not sure that the Apple Watch was the originally intended use case.

From the original force touch patent:

Electronic devices such as portable computers and other equipment may be provided with touch pads that include force sensors. Tactile feedback may also be provided.

As I read through the patent, the sense I get is that the original push for the Force Touch mechanism was to improve the existing track pad experience. Also, note that the filing date of the patent was December 10th, 2009. I suspect the idea of using Force Touch in the Apple Watch design evolved from the original idea of using force touch on a computer and, perhaps, on the iPhone.

That said, I still like M.G.’s take on this and agree: Force Touch is poised to rule all Apple devices.