Offizieller Kommentar
When you purchased a CDJ or DJM, you bought it for the features it had at that time, not for the promise that in the future another product would have bigger and better functions that would trickle down to the previous models.
Yes, it would be lovely to never need to update our hardware, but in reality, the hardware itself has limitations in processing and memory as well, so business growth through hardware sales aside, it's plausible that Pioneer simply can't put those features into the existing products.