Since I’m being quoted, let’s see that quote in context!
Maxing out their existing keyboard or getting the best from using a keyboard? If you mean the latter, the answer is, as always: use a programmable keyboard. (Shakes tambourine.)
(Emphasis added).
So, programmable keyboards are not a solution for every problem, of course, and I wonder if, @frankb, you have a particular problem in mind that you would like the Flux Keyboard to fix… or if, perhaps, those fancy graphic tricks and angel choir pads in the video just make a new toy seem attractive!
I can imagine that the Flux would be a wonderful solution for some uses, but most users will not really have a need to, for instance, hunt-and-peck for obscure symbols much of the time in practice. Any gear lust can be shaken off by a look at the price: $540. That seems very reasonable for what one gets, if it provides what one needs.
In any case, the Flux does not, in fact, appear to be a fully programmable keyboard at all. It seems from its FAQ that the supplied software is for what the keyboard displays, rather than providing layers, different behaviour depending on tapping keys versus holding them and the other tricks of, for example, QMK.
Since this question does not relate specifically to KM, it might be deemed off-topic unless, perhaps, you can knock together a macro or two to reproduce some of the Flux’s functionality in KM? Now that would be alchemy! 