The ASUS ROG Azoth Extreme is a great example of how to take an already good keyboard, with the ROG Azoth, and improving it further to the point of being one of the best pre-built units on the market. It has a ton of features including an OLED touchscreen display and a novel adjustable gasket mount, but is far from being affordable.
In this case it looks like “extreme” really just means 10 keyless which is a neat fad right now where people are liking the “minimalistic” keyboards which are nice if space is a concern but really every manufacturer is jumping on it because it translates to making less keyboard overall and charging more for it.