I think the nic salt thing is a bit overblown as well, and as far as vaping both in one device, it may not MATTER much, unless you want to vape the nicsalts at a vastly higher percentage (you don't HAVE to by the way) nic salts can be vaped at any level.
I have been diy nic salts at 18 mg/ml for a while. I got them because my throat was torn up there for a while.
I will also note, I guess coil resistance may play a role, but honestly if you have a fixed wattage setup I don't know HOW much of a role there may be.
I also don't really get the auto detect thing, I mean you will be filling the device with WHATEVER nic, so you'll already KNOW what you have in there and can make adjustments on your own where like, you know what coil and wattage and etc.
I guess the only thing I could see being useful is some franken device that had two separate tanks on it and you can switch between each tank. Although, you'd still be SWITCHING so I'm not entirely clear on the need/viability of an auto detect device, although by all means have at it if it's something you want and etc.
Anna