1. Arrays ≠ Everything. Please stop with the straw men.
2. "Compiler Advances Double Computing Power Every 50 Years, And The Interval Keeps Growing". (i.e. even Probsting was wildly optimistic when it comes to the benefits of compiler research). The benefits of these shenanigans are much less than even the critics thought, never mind what the advocates claim. They are actually small and shrinking.
The people who want their program to be fast. "Just do everything in main memory" means your program will be extremely slow.