I appreciate you taking the time to write a big response -- it helps us all when someone takes the time to write a lot of info.
To explain the way the electronic manufacturing world works (and a lot of consumer industries) is this example for XP. These numbers are made up and are used only to explain the process.
1. XP Sales team says that there are people who will buy a $1,600 detector.
2. XP Bean counters say to sell a $1,600 machine it must cost XP $500
3. XP Marketing says for people to buy a $1,600 detector it must have X features
4. XP Engineering team has to make a $500 detector with X features.
That it how it works. XP engineering doesn't have the luxury of putting in an unlimited CPU. In other words they can't spend $495 on a CPU leaving only $5.00 for the rest of the machine. They have to make trade offs.
And you can't let engineers make up their own machine because it'll cost $900,000 by the time they are done.
This is why a company like Garrett has 10 different detectors. The engineering team had $100 to make an Ace, $300 to make an AT Max, etc.
My guess is that all of the processing power of the Deus 2 is located in the coil instead of the RC. That is why their coils are so expensive. They shot themselves in the foot with that one.
I would also say that after using the XP Deus 2 it appears to me that XP does not employ a usability engineer.
Happy hunting!