Oh come on. You seem to be deliberately trying to ignore my point.
First, it isn’t free to replace the head unit, particularly when the head unit contains HVAC controls like the LC. You can’t just go to Pioneer and order a new one off the shelf. This isn’t a standard double-DIN headunit with an interchangeable size. Instead, each is custom designed to the vehicle and has to be tested on that vehicle.
That engineering work costs millions of dollars. Whether Toyota performs the engineering or Pioneer does that, it still costs millions, and that cost has to be recovered. We don’t know exactly how much that will cost. Let’s assume that costs $10M for the engineering (I suspect the real number is much, much higher).
That engineering cost is incurred whether you build 140,000 units or 3,200 units. At the 4Runner‘s volume of 140,000 units, that comes to roughly $70 per 4Runner. At 3,200 units, that comes to roughly $3100 per Land Cruiser, which would simply be untenable. Toyota would likely amortize the engineering cost over more than a single year of production, but we don’t know how many years.
Finally, Toyota has dozens of different lines of vehicles. They just started implementing CarPlay. It makes sense that they started with their highest volume models, primarily those that were being redesigned. I believe that the 4Runner and Tacoma were the first two that were given CarPlay without a redesign.
You want CarPlay. I get it. I want it, too. But what we want doesn’t change the required engineering to design, integrate, and test a new headunit.