Which makes the 5000 redundant compared to the 4500.
Why didnt you just make ITCH native to the 4500 then and sell different versions with different software?
4500+ Traktor
4500+ Itch
etc.....
Because the HC4500 hardware design is a non fit for the ITCH GUI.
The HC5000 hardware was designed in conjunction with the Serato team so that things are 1 to 1, plug&play and intuitive. Just take a look at the top panels and compare the differences.
The HC4500 on the other hand was designed to be an open based controller with a generic key layout that any app could adopt to, just like SSL, VDJ, OTS, DEX, and Rockit.