Ok, taking for granted that amperage is not adjustable, that leaves you with 3 variables; voltage, resistance, build of atty/carto.
I am going to reference cartos because I don't use atties. ( I seem to be sensitive to a metallic taste if I use an atty or even a metal drip tip)
If I stick to one type of carto, and the device automatically senses the resistance ( we all know you can get wide variances in ohm's even if you use the same type of carto every time ), and automatically adjust the voltage to give me a target wattage for that particular carto ( even when I am swapping out 3 or 4 diff cartos for flavors ) every time I hit the button, then that gives me ( an average user who doesn't have the equipment or the knowledge to test resistance or voltage under load for every diff carto I use ) a consistent vape. At least for the hdw side of things. That leaves one variable, the juice. Now I can experiment with the juice vg/pg/flavor mix ratios knowing that I am getting a consistent temp for all my cartos.
Somebody mentioned that they use one atty for six months so they can adjust voltage for the sweet spot on that atty with no problem and a lot cheaper. I'll concede to that argument, of course, when they are ready for a new atty they will have to fiddle with the voltage again; and, if I'm not mistaken, atties tend to change performance after they are broken in and toward the end of their life, so you'd still be fiddling with the voltage a little.
As an average user I am always getting frustrated by finding a good vaping solution just to have the new batty or carto vape differently than the previous ones, even though they were the same brand and model. It seems to me that the Darwin eliminates all these problems, and as I stated earlier in this thread, if the Darwin's lifetime holds true to what was stated earlier, then the price is comparable to using Ego batts while the performance is way above and beyond.
Of course all this is just speculation until the Darwin starts to sell and can prove its claims, I for one hope that it does.