Nope; no changes to existing UIs. Instead a driver, which has its own problems of deployment, as that requires convincing the hardware OEMs.
> It’s also the case that existing designs take into account Fitt’s law. Apple and Google are well aware of these.
Hmmmm ... I don't think so. I remember Bruce Tognazzini wrote about how Apple messed up Fitt's law in a version of OSX, where it was one pixel away from supporting an infinite target.
More recently was Apple's addition of "reachability" which is an incredible kludge.
Apple and Google may have usability research, but that is nothing compared to the deep research done at Xerox Parc. I recall seeing studies on the D* machines which measured the efficiency of several text editors, broken down by select, cut, paste, etc. Xerox first tested and measured alternatives before deciding on the best one.
At the first WWDC for the iPhone (2007?), I went a design lab to review our first app. The designer suggest I put navigation at the top, out of reach. I asked him "What about Fitt's Law?" His reply was "who's that?"
> I’m skeptical you’ll find particularly easy to achieve
I agree; this is incredibly hard to achieve. It involves integrating several moving parts, leveraging: TPUs, crypto, and negotiating with OEMs like Apple. I believe the payoff is worth it.