Or, you know, the dealers order expensive builds because they know they will sell, especially early when people are desperate to get their hands on them, so they are trying to maximize profits. They are going to add on all kinds of extra crap that people don't need, because they know people who are buying off the lot are going to be less picky.Configuring one online is not the same as actually being available, as you noticed. Theory vs reality. The dealerships know people don't shop there for off-road vehicles anymore. No customer of their knows or cares what an electronic active differential is.
The exact same thing happened with the Gladiator when it debuted.
The sales model for Land Rover leans much more heavily on built-to-order configurations than manufacturers who produce more volume, so yeah it's generally the fault of anyone who impatiently buys / tests whatever is randomly available for impulse purchase, instead of ordering a custom build.